The Experts below are selected from a list of 57351 Experts worldwide ranked by ideXlab platform
J Eckert - One of the best experts on this subject based on the ideXlab platform.
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Nanoindentation and wear properties of ti and ti tib composite materials produced by selective laser melting
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: Hooyar Attar, Shima Ehtemamhaghighi, Damon Kent, I V Okulov, H Wendrock, A S Volegov, Mariana Calin, M Bӧnisch, J EckertAbstract:Ti and Ti-TiB composite materials were produced by selective laser melting (SLM). Ti showed an α΄ microstructure, whereas the Ti-TiB composite revealed a distribution of needle-like TiB particles across an α-Ti matrix. Hardness (H) and reduced elastic modulus (Er) were investigated by Nanoindentation using loads of 2, 5 and 10 mN. The results showed higher H and Er values for the Ti-TiB than Ti due to the hardening and stiffening effects of the TiB reinforcements. On increasing the Nanoindentation load, H and Er were decreased. Comparison of the Nanoindentation results with those derived from conventional hardness and compression tests indicated that 5 mN is the most suitable Nanoindentation load to assess the elastic modulus and hardness properties. The wear resistance of the samples was related to their corresponding H/Er and H3/Er2 ratios obtained by Nanoindentation. These investigations showed that there is a high degree of consistency between the characterization using Nanoindentation and the wear evaluation from conventional wear tests.
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Nanoindentation and wear properties of ti and ti tib composite materials produced by selective laser melting
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: Hooyar Attar, Shima Ehtemamhaghighi, Damon Kent, I V Okulov, H Wendrock, M Bӧnisch, A S Volegov, Mariana Calin, J EckertAbstract:Ti and Ti-TiB composite materials were produced by selective laser melting (SLM). Ti showed an α΄ microstructure, whereas the Ti-TiB composite revealed a distribution of needle-like TiB particles across an α-Ti matrix. Hardness (H) and reduced elastic modulus (Er) were investigated by Nanoindentation using loads of 2, 5 and 10 mN. The results showed higher H and Er values for the Ti-TiB than Ti due to the hardening and stiffening effects of the TiB reinforcements. On increasing the Nanoindentation load, H and Er were decreased. Comparison of the Nanoindentation results with those derived from conventional hardness and compression tests indicated that 5 mN is the most suitable Nanoindentation load to assess the elastic modulus and hardness properties. The wear resistance of the samples was related to their corresponding H/Er and H3/Er2 ratios obtained by Nanoindentation. These investigations showed that there is a high degree of consistency between the characterization using Nanoindentation and the wear evaluation from conventional wear tests.
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influences of residual stresses on the serrated flow in bulk metallic glass under elastostatic four point bending a Nanoindentation and atomic force microscopy study
Acta Materialia, 2014Co-Authors: Fabian Haag, Denise Beitelschmidt, J Eckert, Karsten DurstAbstract:Abstract The effects of residual stress on the deformation behavior of a Zr-based bulk metallic glass (BMG) during Nanoindentation were studied by atomic force microscopy. The residual stress was introduced by elastostatically preloading a beam-shaped BMG sample by four-point bending up to tensile and compressive stress levels of ±2.0 GPa for up to 14 days. Strain-rate-controlled Nanoindentations were performed on the four-point bent samples at various times during loading and after unloading to analyze the serrated flow during indentation. The hardness of the alloy, the pile-up behavior as well as the serrations strongly depend on the magnitude and sign of the applied residual stresses. Tensile stresses suppress pile-up formation, decrease the hardness but increase the jump width of the serrated flow during Nanoindentation. In contrast, increased pile-up formation with increased hardness occurs along with a successive serrated flow behavior on the compression side. The discrepancy of pile-up and serrated flow is explained by a difference in the shear banding mechanism. The results suggest that for compressive stress individual shear planes are successively activated, leading to localized shear steps on the surface. For tensile residual stresses, the plastic volume is more widely spread, leading to vanishing pile-up together with an intermittent activation of a big number of shear events, causing big serrations. Due to the widely varying pile-up behavior, a hardness correction was performed. This strongly reduced the apparent hardness variations across the beam. For this specific testing arrangement, only reversible mechanical property variations with time due to long-time prestraining at high elastostatic stresses were observed.
Damon Kent - One of the best experts on this subject based on the ideXlab platform.
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Nanoindentation and wear properties of ti and ti tib composite materials produced by selective laser melting
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: Hooyar Attar, Shima Ehtemamhaghighi, Damon Kent, I V Okulov, H Wendrock, A S Volegov, Mariana Calin, M Bӧnisch, J EckertAbstract:Ti and Ti-TiB composite materials were produced by selective laser melting (SLM). Ti showed an α΄ microstructure, whereas the Ti-TiB composite revealed a distribution of needle-like TiB particles across an α-Ti matrix. Hardness (H) and reduced elastic modulus (Er) were investigated by Nanoindentation using loads of 2, 5 and 10 mN. The results showed higher H and Er values for the Ti-TiB than Ti due to the hardening and stiffening effects of the TiB reinforcements. On increasing the Nanoindentation load, H and Er were decreased. Comparison of the Nanoindentation results with those derived from conventional hardness and compression tests indicated that 5 mN is the most suitable Nanoindentation load to assess the elastic modulus and hardness properties. The wear resistance of the samples was related to their corresponding H/Er and H3/Er2 ratios obtained by Nanoindentation. These investigations showed that there is a high degree of consistency between the characterization using Nanoindentation and the wear evaluation from conventional wear tests.
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Nanoindentation and wear properties of ti and ti tib composite materials produced by selective laser melting
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: Hooyar Attar, Shima Ehtemamhaghighi, Damon Kent, I V Okulov, H Wendrock, M Bӧnisch, A S Volegov, Mariana Calin, J EckertAbstract:Ti and Ti-TiB composite materials were produced by selective laser melting (SLM). Ti showed an α΄ microstructure, whereas the Ti-TiB composite revealed a distribution of needle-like TiB particles across an α-Ti matrix. Hardness (H) and reduced elastic modulus (Er) were investigated by Nanoindentation using loads of 2, 5 and 10 mN. The results showed higher H and Er values for the Ti-TiB than Ti due to the hardening and stiffening effects of the TiB reinforcements. On increasing the Nanoindentation load, H and Er were decreased. Comparison of the Nanoindentation results with those derived from conventional hardness and compression tests indicated that 5 mN is the most suitable Nanoindentation load to assess the elastic modulus and hardness properties. The wear resistance of the samples was related to their corresponding H/Er and H3/Er2 ratios obtained by Nanoindentation. These investigations showed that there is a high degree of consistency between the characterization using Nanoindentation and the wear evaluation from conventional wear tests.
Hooyar Attar - One of the best experts on this subject based on the ideXlab platform.
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Nanoindentation and wear properties of ti and ti tib composite materials produced by selective laser melting
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: Hooyar Attar, Shima Ehtemamhaghighi, Damon Kent, I V Okulov, H Wendrock, A S Volegov, Mariana Calin, M Bӧnisch, J EckertAbstract:Ti and Ti-TiB composite materials were produced by selective laser melting (SLM). Ti showed an α΄ microstructure, whereas the Ti-TiB composite revealed a distribution of needle-like TiB particles across an α-Ti matrix. Hardness (H) and reduced elastic modulus (Er) were investigated by Nanoindentation using loads of 2, 5 and 10 mN. The results showed higher H and Er values for the Ti-TiB than Ti due to the hardening and stiffening effects of the TiB reinforcements. On increasing the Nanoindentation load, H and Er were decreased. Comparison of the Nanoindentation results with those derived from conventional hardness and compression tests indicated that 5 mN is the most suitable Nanoindentation load to assess the elastic modulus and hardness properties. The wear resistance of the samples was related to their corresponding H/Er and H3/Er2 ratios obtained by Nanoindentation. These investigations showed that there is a high degree of consistency between the characterization using Nanoindentation and the wear evaluation from conventional wear tests.
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Nanoindentation and wear properties of ti and ti tib composite materials produced by selective laser melting
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: Hooyar Attar, Shima Ehtemamhaghighi, Damon Kent, I V Okulov, H Wendrock, M Bӧnisch, A S Volegov, Mariana Calin, J EckertAbstract:Ti and Ti-TiB composite materials were produced by selective laser melting (SLM). Ti showed an α΄ microstructure, whereas the Ti-TiB composite revealed a distribution of needle-like TiB particles across an α-Ti matrix. Hardness (H) and reduced elastic modulus (Er) were investigated by Nanoindentation using loads of 2, 5 and 10 mN. The results showed higher H and Er values for the Ti-TiB than Ti due to the hardening and stiffening effects of the TiB reinforcements. On increasing the Nanoindentation load, H and Er were decreased. Comparison of the Nanoindentation results with those derived from conventional hardness and compression tests indicated that 5 mN is the most suitable Nanoindentation load to assess the elastic modulus and hardness properties. The wear resistance of the samples was related to their corresponding H/Er and H3/Er2 ratios obtained by Nanoindentation. These investigations showed that there is a high degree of consistency between the characterization using Nanoindentation and the wear evaluation from conventional wear tests.
Mariana Calin - One of the best experts on this subject based on the ideXlab platform.
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Nanoindentation and wear properties of ti and ti tib composite materials produced by selective laser melting
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: Hooyar Attar, Shima Ehtemamhaghighi, Damon Kent, I V Okulov, H Wendrock, A S Volegov, Mariana Calin, M Bӧnisch, J EckertAbstract:Ti and Ti-TiB composite materials were produced by selective laser melting (SLM). Ti showed an α΄ microstructure, whereas the Ti-TiB composite revealed a distribution of needle-like TiB particles across an α-Ti matrix. Hardness (H) and reduced elastic modulus (Er) were investigated by Nanoindentation using loads of 2, 5 and 10 mN. The results showed higher H and Er values for the Ti-TiB than Ti due to the hardening and stiffening effects of the TiB reinforcements. On increasing the Nanoindentation load, H and Er were decreased. Comparison of the Nanoindentation results with those derived from conventional hardness and compression tests indicated that 5 mN is the most suitable Nanoindentation load to assess the elastic modulus and hardness properties. The wear resistance of the samples was related to their corresponding H/Er and H3/Er2 ratios obtained by Nanoindentation. These investigations showed that there is a high degree of consistency between the characterization using Nanoindentation and the wear evaluation from conventional wear tests.
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Nanoindentation and wear properties of ti and ti tib composite materials produced by selective laser melting
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: Hooyar Attar, Shima Ehtemamhaghighi, Damon Kent, I V Okulov, H Wendrock, M Bӧnisch, A S Volegov, Mariana Calin, J EckertAbstract:Ti and Ti-TiB composite materials were produced by selective laser melting (SLM). Ti showed an α΄ microstructure, whereas the Ti-TiB composite revealed a distribution of needle-like TiB particles across an α-Ti matrix. Hardness (H) and reduced elastic modulus (Er) were investigated by Nanoindentation using loads of 2, 5 and 10 mN. The results showed higher H and Er values for the Ti-TiB than Ti due to the hardening and stiffening effects of the TiB reinforcements. On increasing the Nanoindentation load, H and Er were decreased. Comparison of the Nanoindentation results with those derived from conventional hardness and compression tests indicated that 5 mN is the most suitable Nanoindentation load to assess the elastic modulus and hardness properties. The wear resistance of the samples was related to their corresponding H/Er and H3/Er2 ratios obtained by Nanoindentation. These investigations showed that there is a high degree of consistency between the characterization using Nanoindentation and the wear evaluation from conventional wear tests.
H Wendrock - One of the best experts on this subject based on the ideXlab platform.
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Nanoindentation and wear properties of ti and ti tib composite materials produced by selective laser melting
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: Hooyar Attar, Shima Ehtemamhaghighi, Damon Kent, I V Okulov, H Wendrock, A S Volegov, Mariana Calin, M Bӧnisch, J EckertAbstract:Ti and Ti-TiB composite materials were produced by selective laser melting (SLM). Ti showed an α΄ microstructure, whereas the Ti-TiB composite revealed a distribution of needle-like TiB particles across an α-Ti matrix. Hardness (H) and reduced elastic modulus (Er) were investigated by Nanoindentation using loads of 2, 5 and 10 mN. The results showed higher H and Er values for the Ti-TiB than Ti due to the hardening and stiffening effects of the TiB reinforcements. On increasing the Nanoindentation load, H and Er were decreased. Comparison of the Nanoindentation results with those derived from conventional hardness and compression tests indicated that 5 mN is the most suitable Nanoindentation load to assess the elastic modulus and hardness properties. The wear resistance of the samples was related to their corresponding H/Er and H3/Er2 ratios obtained by Nanoindentation. These investigations showed that there is a high degree of consistency between the characterization using Nanoindentation and the wear evaluation from conventional wear tests.
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Nanoindentation and wear properties of ti and ti tib composite materials produced by selective laser melting
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: Hooyar Attar, Shima Ehtemamhaghighi, Damon Kent, I V Okulov, H Wendrock, M Bӧnisch, A S Volegov, Mariana Calin, J EckertAbstract:Ti and Ti-TiB composite materials were produced by selective laser melting (SLM). Ti showed an α΄ microstructure, whereas the Ti-TiB composite revealed a distribution of needle-like TiB particles across an α-Ti matrix. Hardness (H) and reduced elastic modulus (Er) were investigated by Nanoindentation using loads of 2, 5 and 10 mN. The results showed higher H and Er values for the Ti-TiB than Ti due to the hardening and stiffening effects of the TiB reinforcements. On increasing the Nanoindentation load, H and Er were decreased. Comparison of the Nanoindentation results with those derived from conventional hardness and compression tests indicated that 5 mN is the most suitable Nanoindentation load to assess the elastic modulus and hardness properties. The wear resistance of the samples was related to their corresponding H/Er and H3/Er2 ratios obtained by Nanoindentation. These investigations showed that there is a high degree of consistency between the characterization using Nanoindentation and the wear evaluation from conventional wear tests.
