首页|Spinodal decomposition-mediated multi-architectured α precipitates making a metastable β-Ti alloy ultra-strong and ductile

Spinodal decomposition-mediated multi-architectured α precipitates making a metastable β-Ti alloy ultra-strong and ductile

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The chemical boundaries inside the ultrafine spinodal decomposition structure in metastable β-Ti al-loys can act as a new feature to architect heterogeneous microstructures.In this work,we combined two semi-empirical methods,i.e.,the d-electron theory and the e/a electron concentration,to achieve the spinodal decomposition structure in a metastable β Ti-4.5Al-4.5Mo-7V-1.5Cr-1.5Zr(wt.％)alloy.Utiliz-ing the spinodal decomposition structure,the aged Ti-Al-Mo-V-Cr-Zr alloys showed multi-architecturedα precipitates spanning from micron-scale(primary αp)to nano-scale(secondary αs)that were uni-formly distributed in the β-domains.Being compared with the forged sample,the multi-scale heteroge-neous microstructure enables the aged β-Ti alloy to have ultra-high strength(yield strength～1366 MPa and ultimate tensile strength～1424 MPa)and an appreciable ductility(～9.3％).Strengthening models were proposed for the present alloys to estimate the contribution of various microstructural features to the measured yield strength.While the solid solution strengthening,β-spinodal strengthening,and back stress strengthening made comparable contributions to the strength of the forged alloy,the back stress strengthening was the predominant strengthening effect in the aged alloy.This alloy design ap-proach based on chemical boundary engineering to construct multi-architectured α precipitates provided an effective strategy for achieving an outstanding combination of ultra-high strength and ductility in metastable β-Ti alloys.

Ti alloysMulti-architectured α precipitatesSpinodal decompositionMechanical propertiesStrengthening mechanisms

J.K.Yang、C.L.Zhang、H.Zhang、J.Li、J.Y.Zhang、J.Kuang、G.Liu、J.Sun

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State-key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaShaanxi Province Youth Innovation Team ProjectShaanxi Province Innovation Team ProjectFundamental Research Funds for the Central Universities

92163201U206721922JP0422024RS-CXTD-58xtr022019004

2024

10.1016/j.jmst.2023.11.071

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.191(24)