The Experts below are selected from a list of 31797 Experts worldwide ranked by ideXlab platform
Takao Hanawa - One of the best experts on this subject based on the ideXlab platform.
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microstructure and magnetic susceptibility of as cast zr Mo alloys
Acta Biomaterialia, 2010Co-Authors: Naoyuki Nomura, Kei Oya, Yuko Tanaka, Ryota Kondo, Hisashi Doi, Yusuke Tsutsumi, Takao HanawaAbstract:The microstructures and magnetic susceptibilities of Zr-Mo alloys were investigated to develop a Zr alloy with a low magnetic susceptibility for magnetic resonance imaging (MRI). The microstructure was evaluated with an X-ray diffractometer (XRD), an optical microscope (OM) and a transmission electron microscope (TEM), and the magnetic susceptibility was measured with a magnetic susceptibility balance. The alpha' phase with acicular structure was dominant in Zr-1Mo alloys, while the omega and beta phases with the equiaxed and relatively flat (no acicular) microstructure was dominant in Zr-3Mo. The mixed microstructural features of Zr-1Mo and Zr-3Mo were observed in Zr-2Mo, which consists of the alpha', omega and beta phases. The beta phase is stabilized when the Mo Content exceeds over 3 mass% Mo. As-cast Zr-Mo alloys showed a minimum value of magnetic susceptibility at 3 mass% Mo, and the value abruptly increased up to 10% Mo before remaining stable up to 15 mass% Mo. XRD, OM and TEM revealed that the minimum value of the susceptibility was closely related to the appearance of the athermal omega phase in the beta phase. As the Mo Content decreases from 3 mass%, the alpha' phase appears with the omega and beta phases. On the other hand, as the Mo Content increases from 3 mass%, the beta phase increases and the omega phase decreases. Thus the appearance of the alpha' and beta phase leads to an increase in magnetic susceptibility. The magnetic susceptibility of as-cast Zr-3Mo alloy was alMost one-third that of Ti-6Al-4V, which is comMonly used for medical implant devices. Zr-Mo alloys are useful for medical devices used under MRI.
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microstructure and magnetic susceptibility of as cast zr Mo alloys
Acta Biomaterialia, 2010Co-Authors: Naoyuki Nomura, Yuko Tanaka, Ryota Kondo, Yusuke Tsutsumi, Takao HanawaAbstract:Abstract The microstructures and magnetic susceptibilities of Zr–Mo alloys were investigated to develop a Zr alloy with a low magnetic susceptibility for magnetic resonance imaging (MRI). The microstructure was evaluated with an X-ray diffractometer (XRD), an optical microscope (OM) and a transmission electron microscope (TEM), and the magnetic susceptibility was measured with a magnetic susceptibility balance. The α ′ phase with acicular structure was dominant in Zr–1Mo alloys, while the ω and β phases with the equiaxed and relatively flat (no acicular) microstructure was dominant in Zr–3Mo. The mixed microstructural features of Zr–1Mo and Zr–3Mo were observed in Zr–2Mo, which consists of the α ′, ω and β phases. The β phase is stabilized when the Mo Content exceeds over 3 mass% Mo. As-cast Zr–Mo alloys showed a minimum value of magnetic susceptibility at 3 mass% Mo, and the value abruptly increased up to 10% Mo before remaining stable up to 15 mass% Mo. XRD, OM and TEM revealed that the minimum value of the susceptibility was closely related to the appearance of the athermal ω phase in the β phase. As the Mo Content decreases from 3 mass%, the α ′ phase appears with the ω and β phases. On the other hand, as the Mo Content increases from 3 mass%, the β phase increases and the ω phase decreases. Thus the appearance of the α ′ and β phase leads to an increase in magnetic susceptibility. The magnetic susceptibility of as-cast Zr–3Mo alloy was alMost one-third that of Ti–6Al–4V, which is comMonly used for medical implant devices. Zr–Mo alloys are useful for medical devices used under MRI.
Naoyuki Nomura - One of the best experts on this subject based on the ideXlab platform.
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microstructure and magnetic susceptibility of as cast zr Mo alloys
Acta Biomaterialia, 2010Co-Authors: Naoyuki Nomura, Kei Oya, Yuko Tanaka, Ryota Kondo, Hisashi Doi, Yusuke Tsutsumi, Takao HanawaAbstract:The microstructures and magnetic susceptibilities of Zr-Mo alloys were investigated to develop a Zr alloy with a low magnetic susceptibility for magnetic resonance imaging (MRI). The microstructure was evaluated with an X-ray diffractometer (XRD), an optical microscope (OM) and a transmission electron microscope (TEM), and the magnetic susceptibility was measured with a magnetic susceptibility balance. The alpha' phase with acicular structure was dominant in Zr-1Mo alloys, while the omega and beta phases with the equiaxed and relatively flat (no acicular) microstructure was dominant in Zr-3Mo. The mixed microstructural features of Zr-1Mo and Zr-3Mo were observed in Zr-2Mo, which consists of the alpha', omega and beta phases. The beta phase is stabilized when the Mo Content exceeds over 3 mass% Mo. As-cast Zr-Mo alloys showed a minimum value of magnetic susceptibility at 3 mass% Mo, and the value abruptly increased up to 10% Mo before remaining stable up to 15 mass% Mo. XRD, OM and TEM revealed that the minimum value of the susceptibility was closely related to the appearance of the athermal omega phase in the beta phase. As the Mo Content decreases from 3 mass%, the alpha' phase appears with the omega and beta phases. On the other hand, as the Mo Content increases from 3 mass%, the beta phase increases and the omega phase decreases. Thus the appearance of the alpha' and beta phase leads to an increase in magnetic susceptibility. The magnetic susceptibility of as-cast Zr-3Mo alloy was alMost one-third that of Ti-6Al-4V, which is comMonly used for medical implant devices. Zr-Mo alloys are useful for medical devices used under MRI.
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microstructure and magnetic susceptibility of as cast zr Mo alloys
Acta Biomaterialia, 2010Co-Authors: Naoyuki Nomura, Yuko Tanaka, Ryota Kondo, Yusuke Tsutsumi, Takao HanawaAbstract:Abstract The microstructures and magnetic susceptibilities of Zr–Mo alloys were investigated to develop a Zr alloy with a low magnetic susceptibility for magnetic resonance imaging (MRI). The microstructure was evaluated with an X-ray diffractometer (XRD), an optical microscope (OM) and a transmission electron microscope (TEM), and the magnetic susceptibility was measured with a magnetic susceptibility balance. The α ′ phase with acicular structure was dominant in Zr–1Mo alloys, while the ω and β phases with the equiaxed and relatively flat (no acicular) microstructure was dominant in Zr–3Mo. The mixed microstructural features of Zr–1Mo and Zr–3Mo were observed in Zr–2Mo, which consists of the α ′, ω and β phases. The β phase is stabilized when the Mo Content exceeds over 3 mass% Mo. As-cast Zr–Mo alloys showed a minimum value of magnetic susceptibility at 3 mass% Mo, and the value abruptly increased up to 10% Mo before remaining stable up to 15 mass% Mo. XRD, OM and TEM revealed that the minimum value of the susceptibility was closely related to the appearance of the athermal ω phase in the β phase. As the Mo Content decreases from 3 mass%, the α ′ phase appears with the ω and β phases. On the other hand, as the Mo Content increases from 3 mass%, the β phase increases and the ω phase decreases. Thus the appearance of the α ′ and β phase leads to an increase in magnetic susceptibility. The magnetic susceptibility of as-cast Zr–3Mo alloy was alMost one-third that of Ti–6Al–4V, which is comMonly used for medical implant devices. Zr–Mo alloys are useful for medical devices used under MRI.
C P Ju - One of the best experts on this subject based on the ideXlab platform.
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structure and properties of cast binary ti Mo alloys
Biomaterials, 1999Co-Authors: W F Ho, C P JuAbstract:Structure and properties of a series of binary Ti–Mo alloys with Molybdenum Contents ranging from 6 to 20 wt% have been investigated. Experimental results indicated that crystal structure and Morphology of the cast alloys were sensitive to their Molybdenum Contents. The hexagonal α′ phase c.p. Ti exhibited a feather-like Morphology. When Mo Content was 6 wt%, a fine, acicular martensitic structure of orthorhombic α″ phase was observed. When Mo Content was 7.5 wt%, the entire alloy was dominated by the martensitic α″ structure. When Mo Content was increased to 10 wt% or higher, the retained β phase became the only dominant phase. AMong all Ti–Mo alloys, the α″ phase Ti–7.5Mo alloy had the lowest hardness. The bending strength of Ti–7.5Mo was similar to that of Ti–15Mo and Ti–13Nb–13Zr, and higher than c.p. Ti by nearly 60%. The bending Modulus of the α″-dominated Ti–7.5Mo alloy was lower than that of Ti–15Mo by 22%, of Ti–6Al–4V by 47%, of Ti–13Nb–13Zr by 17%, and of c.p. Ti by 40%.
J Chern H Lin - One of the best experts on this subject based on the ideXlab platform.
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structure and properties of cast binary ti Mo alloys
Biomaterials, 1999Co-Authors: J Chern H LinAbstract:Structure and properties of a series of binary Ti–Mo alloys with Molybdenum Contents ranging from 6 to 20 wt% have been investigated. Experimental results indicated that crystal structure and Morphology of the cast alloys were sensitive to their Molybdenum Contents. The hexagonal α′ phase c.p. Ti exhibited a feather-like Morphology. When Mo Content was 6 wt%, a fine, acicular martensitic structure of orthorhombic α″ phase was observed. When Mo Content was 7.5 wt%, the entire alloy was dominated by the martensitic α″ structure. When Mo Content was increased to 10 wt% or higher, the retained β phase became the only dominant phase. AMong all Ti–Mo alloys, the α″ phase Ti–7.5Mo alloy had the lowest hardness. The bending strength of Ti–7.5Mo was similar to that of Ti–15Mo and Ti–13Nb–13Zr, and higher than c.p. Ti by nearly 60%. The bending Modulus of the α″-dominated Ti–7.5Mo alloy was lower than that of Ti–15Mo by 22%, of Ti–6Al–4V by 47%, of Ti–13Nb–13Zr by 17%, and of c.p. Ti by 40%.
Sheng Kai Gong - One of the best experts on this subject based on the ideXlab platform.
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Effect of Mo Content on microstructure and stress-rupture properties of a Ni-base single crystal superalloy
Progress in Natural Science: Materials International, 2016Co-Authors: Yunfei Liang, Yafang Han, Sheng Kai GongAbstract:Abstract The additional 1.5 wt% Mo was added in a Ni-base single crystal (SC) alloy with the composition of Ni–6.5Al–8.0Mo–2.4Cr–6.2Ta–4.9Co–1.5Re–(0.01–0.05)Y (wt%) to study the effect of Mo Content on the microstructure and stress-rupture properties. The creep and stress-rupture tests under the conditions of 850 °C/500 MPa and 1100 °C/130 MPa were conducted, and the microstructure of as-cast, heat treated and stress ruptured specimens were analyzed. It was found that the 1.5 wt% Mo addition enhanced the stress-rupture lives at both intermediate (850 °C) and high (1100 °C) temperatures. The microstructure analysis showed that adding 1.5 wt% Mo in the basic alloy affected the microstructure dramatically, i.e., the Mo-rich phases formed in the specimens of as-cast and stress-ruptured specimens. It is considered that the improvement of the stress-rupture lives is duo to the strengthening effect of Mo to both γ and γ′ phases and the decrease of stacking fault energy, diffusion constant and dislocation spacing. The Mo-rich phases precipitated under condition of 1100 °C/130 MPa did not affect the creep and stress-rupture properties obviously in the present study.
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oxidation and microstructure evolution of al si coated ni3al based single crystal superalloy with high Mo Content
Applied Surface Science, 2015Co-Authors: Hui Peng, Lei Zheng, Hongbo Guo, Sheng Kai GongAbstract:Abstract A Si Modified aluminide (Al–Si) coating was prepared on a Ni 3 Al based single crystal superalloy with high Mo Content by high-activity pack cementation. Cyclic oxidation test at 1150 °C was carried out and the microstructure evolution of the coating was investigated. The results show that the oxidation resistance of the substrate was greatly increased by applying an Al–Si coating. During oxidation, outward diffusion of Mo was effectively blocked due to its high affinity with Si. Besides, a layered structure was formed as a result of the elements inter-diffusion. An obvious degradation of the Al–Si coating was observed after 100 h oxidation. Possible mechanisms related to the oxidation and elements inter-diffusion behaviours were also discussed.