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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effects of beta-stabilizer elements on microstructure formation and mechanical properties of titanium alloys
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Effects of beta-stabilizer elements on microstructure formation and mechanical properties of titanium alloys

机译：β-稳定剂对钛合金微观结构形成和机械性能的影响

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摘要

Binary Ti-4(Nb, V, Fe) alloys were prepared to investigate the effects of beta-stabilizers (Nb, V and Fe) on microstructure formation and mechanical properties of titanium alloys by using experimental and theoretical methods. Microstructure observations revealed that addition of Nb, V or Fe significantly tailored the microstructure under different heat-treated conditions, i.e., furnace-cooled (FC), air-cooled (FC) and water quenched (WQ). The FC Ti & ndash;4(Nb, V, Fe) alloys exhibited the Widmanst & auml;tten microstructure and the AC samples showed the spheroidized microstructure. The WQ Ti & ndash;4Fe exhibited the microstructure composed of equiaxed beta grains and nanoscale omega particles while the WQ Ti & ndash;4Nb and Ti & ndash;4V showed the martensite microstructure. Differentials of microstructure can be attributed to the effects of Nb, V and Fe elements on the phase stability and energy barrier of phase transformation according to the empirical electron theory (EET) of solids and molecules. Results of tensile tests showed that Nb, V and Fe significantly influenced the tensile properties under the different heat treatments. Both the WQ Ti & ndash;4Nb and Ti & ndash;4V showed the larger tensile strength than that of the FC and AC sample due to the stronger solid-solution and phase-interface strengthening in martensite structure. The WQ Ti & ndash;4Fe sample exhibited the largest tensile strength (1104 MPa) compared to that of the FC (754 MPa) and AC (981 MPa) samples due to the strongest solid solution and phase-interface strengthening from the omega phase. By executing the methods of the empirical electron theory (EET) of solids and molecules, effects of beta-stabilizers (Nb, V and Fe) on microstructure formation and mechanical properties of titanium alloys were revealed on the view of valence electron.
机译：采用实验和理论方法制备了二元Ti-4（Nb，V，Fe）合金，研究了β稳定剂（Nb，V，Fe）对钛合金显微组织形成和力学性能的影响。微观结构观察表明，在不同的热处理条件下，添加Nb、V或Fe可显著调整微观结构，即炉冷（FC）、风冷（FC）和水淬（WQ）。FC Ti&ndash；4（Nb，V，Fe）合金表现出魏氏和auml；tten组织和AC试样均为球化组织。WQ Ti&ndash；4Fe呈现出由等轴β晶粒和纳米omega颗粒组成的微观结构，而WQ Ti&ndash；4Nb和Ti&ndash；4V为马氏体组织。根据固体和分子的经验电子理论（EET），微观结构的差异可归因于Nb、V和Fe元素对相变的相稳定性和势垒的影响。拉伸试验结果表明，Nb、V和Fe对不同热处理下的拉伸性能有显著影响。WQ-Ti&ndash；4Nb和Ti&ndash；4V试样的拉伸强度比FC和AC试样的大，这是由于马氏体组织中有较强的固溶体和相界面强化。WQ Ti&ndash；与FC（754 MPa）和AC（981 MPa）样品相比，4Fe样品表现出最大的拉伸强度（1104 MPa），这是因为omega相的固溶体和相界面强化最强。采用固体和分子的经验电子理论（EET）方法，从价电子的角度揭示了β稳定剂（Nb、V和Fe）对钛合金微观结构形成和力学性能的影响。

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