The Experts below are selected from a list of 3711 Experts worldwide ranked by ideXlab platform
K Hono - One of the best experts on this subject based on the ideXlab platform.
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strong and ductile heat treatable mg sn zn al Wrought Alloys
Acta Materialia, 2015Co-Authors: Takayoshi Sasaki, Shigeharu Kamado, K Hono, F R Elsayed, T Nakata, T OhkuboAbstract:Abstract A newly developed Mg–Sn–Zn–Al based alloy shows substantial strengthening by artificial aging. A Na-doped Mg–5.4Sn–4.2Zn–2.0Al–0.2Mn–0.1Na (TZAM5420−0.1Na) (wt.%) alloy exhibited a significant increase in yield strength from 243 to 347 MPa by a T6 treatment due to the uniform dispersion of nanoscale precipitates by aging. The trace addition of Na causes the formation of Sn–Na co-clusters in the early stage of aging, which provides heterogeneous nucleation sites for Mg 2 Sn precipitates. However, Na strongly segregates at grain boundaries and this degrades the ductility significantly. To overcome this problem, we developed a Na-free Mg–6.6Sn–5.9Zn–2.0Al–0.2Mn (TZAM6620) alloy, in which nano-scale MgZn 2 precipitates are uniformly dispersed by double aging. Pre-aging caused the formation of Zn-rich Guinier Preston zones, which acted as heterogeneous nucleation sites for the MgZn 2 precipitates. The double-aged TZAM6620 alloy exhibited a very high yield strength of 370 MPa with large elongation of 14%.
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heat treatable mg sn zn Wrought alloy
Scripta Materialia, 2009Co-Authors: Tomoyuki Sasaki, J D Ju, K Hono, Kwang Seon ShinAbstract:We report enhanced room-temperature tensile and creep properties of extruded Mg–Sn–Zn Alloys by solution heat-treatment and artificial aging. Microstructure observations indicated that the improved creep properties were due to the uniform dispersion of Mg 2 Sn and MgZn 2 phase in the coarse grains. The mechanical properties of the heat-treated extruded Alloys are comparable to commercial Wrought magnesium Alloys, and thus are promising as new heat-treatable Wrought Alloys.
Kwang Seon Shin - One of the best experts on this subject based on the ideXlab platform.
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heat treatable mg sn zn Wrought alloy
Scripta Materialia, 2009Co-Authors: Tomoyuki Sasaki, J D Ju, K Hono, Kwang Seon ShinAbstract:We report enhanced room-temperature tensile and creep properties of extruded Mg–Sn–Zn Alloys by solution heat-treatment and artificial aging. Microstructure observations indicated that the improved creep properties were due to the uniform dispersion of Mg 2 Sn and MgZn 2 phase in the coarse grains. The mechanical properties of the heat-treated extruded Alloys are comparable to commercial Wrought magnesium Alloys, and thus are promising as new heat-treatable Wrought Alloys.
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stress corrosion cracking of new mg zn mn Wrought Alloys containing si
Corrosion Science, 2008Co-Authors: G Benhamu, D Eliezer, W Dietzel, Kwang Seon ShinAbstract:Abstract The stress corrosion cracking (SCC) of high strength and ductility Mg–Zn–Mn Alloys containing Si was studied using the slow strain rate test (SSRT) technique in air and in 3.5 wt% NaCl solution saturated with Mg(OH) 2 . All Alloys were susceptible to SCC to some extent. The fractography was consistent with a significant component of intergranular SCC (IGSCC). The TGSCC fracture path in ZSM620 is consistent with a mechanism involving hydrogen. In each case, the IGSCC appeared to be associated with the second-phase particles along grain boundaries. For the IGSCC of the ZSM6X0 Alloys, the fractography was consistent with micro-galvanic acceleration of the corrosion of α-magnesium by the second-phase particles, whereas it appeared that the second-phase particles themselves had corroded. The study suggests that Si addition to Mg–Zn–Mn Alloys can significantly improve SCC resistance as observed in the case of ZSM620. However, the SCC resistance also depends on the other critical alloying elements such as zinc and the microstructure.
Xiang Zhang - One of the best experts on this subject based on the ideXlab platform.
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fatigue crack propagation behaviour in wire arc additive manufactured ti 6al 4v effects of microstructure and residual stress
Materials & Design, 2016Co-Authors: Jikui Zhang, Xueyuan Wang, Sanjooram Paddea, Xiang ZhangAbstract:Abstract Fatigue crack propagation tests of Ti‐6Al‐4V fabricated by the Wire+Arc Additive Manufacturing (WAAM) process are analysed. Crack growth rate and trajectory are examined before and after the crack tip crossing an interface between the WAAM and Wrought Alloys. The study has focused on the microstructure and residual stress effect. First, the differences in crack growth rate and path between WAAM and Wrought Alloys are attributed to their different microstructure; the equiaxed Wrought alloy has straight crack path, whereas the WAAM lamellar structure causes tortuous crack path resulting in lower crack growth rate. Second, based on measured residual stress profile in the as-built WAAM piece, retained residual stress in the much smaller compact tension specimens and its effect on crack growth rate are calculated by the finite element method. Numerical simulation shows considerable residual stress in the test specimen and the stress magnitude depends on the initial crack location and propagation direction in relation to the WAAM-Wrought interface. Residual stress is released immediately if the initial crack is in the Wrought substrate; hence it has little effect. In contrast, when crack grows from WAAM to Wrought, residual stress is retained resulting in higher stress intensity factor; hence greater crack growth rate.
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Fatigue crack propagation behaviour in wire+arc additive manufactured Ti‐6Al‐4V: Effects of microstructure and residual stress
Materials & Design, 2016Co-Authors: Jikui Zhang, Xueyuan Wang, Sanjooram Paddea, Xiang ZhangAbstract:Abstract Fatigue crack propagation tests of Ti‐6Al‐4V fabricated by the Wire+Arc Additive Manufacturing (WAAM) process are analysed. Crack growth rate and trajectory are examined before and after the crack tip crossing an interface between the WAAM and Wrought Alloys. The study has focused on the microstructure and residual stress effect. First, the differences in crack growth rate and path between WAAM and Wrought Alloys are attributed to their different microstructure; the equiaxed Wrought alloy has straight crack path, whereas the WAAM lamellar structure causes tortuous crack path resulting in lower crack growth rate. Second, based on measured residual stress profile in the as-built WAAM piece, retained residual stress in the much smaller compact tension specimens and its effect on crack growth rate are calculated by the finite element method. Numerical simulation shows considerable residual stress in the test specimen and the stress magnitude depends on the initial crack location and propagation direction in relation to the WAAM-Wrought interface. Residual stress is released immediately if the initial crack is in the Wrought substrate; hence it has little effect. In contrast, when crack grows from WAAM to Wrought, residual stress is retained resulting in higher stress intensity factor; hence greater crack growth rate.
A. Plummer - One of the best experts on this subject based on the ideXlab platform.
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mechanical properties of titanium based ti 6al 4v Alloys manufactured by powder bed additive manufacture
Materials Science and Technology, 2017Co-Authors: J Tong, J. Persson, C R Bowen, A. PlummerAbstract:Additive manufacturing is currently a topic of considerable interest at both academic and industrial levels. While a significant amount of data exists on the mechanical properties and structure–property relationships of traditional Wrought Alloys, less information is available on Alloys manufactured by additive manufacture. This review examines current state-of-the-art manufacture of titanium-based Ti–6Al–4V Alloys by powder bed additive manufacture. Published mechanical properties to date are collected which include tensile strength, yield strength, hardness, wear, fracture toughness and fatigue. Differences in microstructure and properties compared to conventional Wrought Alloys of the same composition are described.
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Mechanical properties of titanium-based Ti–6Al–4V Alloys manufactured by powder bed additive manufacture
Materials Science and Technology (United Kingdom), 2017Co-Authors: J Tong, J. Persson, C R Bowen, A. PlummerAbstract:Additive manufacturing is currently a topic of considerable interest at both academic and industrial levels. While a significant amount of data exists on the mechanical properties and structure–property relationships of traditional Wrought Alloys, less information is available on Alloys manufactured by additive manufacture. This review examines current state-of-the-art manufacture of titanium-based Ti–6Al–4V Alloys by powder bed additive manufacture. Published mechanical properties to date are collected which include tensile strength, yield strength, hardness, wear, fracture toughness and fatigue. Differences in microstructure and properties compared to conventional Wrought Alloys of the same composition are described.
Tomoyuki Sasaki - One of the best experts on this subject based on the ideXlab platform.
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heat treatable mg sn zn Wrought alloy
Scripta Materialia, 2009Co-Authors: Tomoyuki Sasaki, J D Ju, K Hono, Kwang Seon ShinAbstract:We report enhanced room-temperature tensile and creep properties of extruded Mg–Sn–Zn Alloys by solution heat-treatment and artificial aging. Microstructure observations indicated that the improved creep properties were due to the uniform dispersion of Mg 2 Sn and MgZn 2 phase in the coarse grains. The mechanical properties of the heat-treated extruded Alloys are comparable to commercial Wrought magnesium Alloys, and thus are promising as new heat-treatable Wrought Alloys.
