首页|Investigation into the stress-strain compatibility and fracture behaviour of a TC18 titanium alloy with a multistage lamellar microstructure

Investigation into the stress-strain compatibility and fracture behaviour of a TC18 titanium alloy with a multistage lamellar microstructure

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Understanding the fracture mechanism is essential for optimizing the mechanical properties of titanium alloys.The relationship between fracture behaviour and the multistage lamellar microstructure of the TC18(Ti-5Al-5Mo-5V-1Cr-1Fe)alloy was investigated via in situ tensile and three-point bending tests.The results indicate that the TC1 8 alloy,featuring a multistage lamellar microstructure(including a β matrix,primary lamellar α phase,bundles,and secondary lamellar α phase),exhibits an excellent combination of strength and ductility.The precipitation of the secondary lamellar α phase significantly enhances the alloy's strength but weakens the stress-strain compatibility of the microstructure.This results in a smaller crack-tip plastic zone(CTPZ)and causes dislocations to concentrate more at the grain boundaries and,to a lesser extent,at the phase interfaces.Consequently,in the later stages of crack propagation,microvoids and microcracks tend to form at dislocation pile-ups.With increasing stress,these microvoids and microcracks rapidly coalesce,leading to a greater proportion of intergranular fracture and thus reducing the fracture toughness of the alloy.

TC18titanium alloysIn situ stretchingCrack-tip plastic zone(CTPZ)Stress-strain compatibilityFracture behaviour

Zhongxiang Li、Zhaoxin Du、Jun Cheng、Zhiyong Yue、Tianhao Gong、Xudong Kang、Yongcheng Zhu

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School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot,010051,China

Collaborative Innovation Center of Non-ferrous Metal Materials and Processing Technology Co-constructed By the Province and Ministry,Inner Mongolia Autonomous Region,Inner Mongolia University of Technology,Hohhot,010051,China

Northwest Institute for Nonferrous Metal Research,Shanxi Key Laboratory of Biomedical Metal Materials,Xi'an,710016,China

School of Mechanical Engineering,Inner Mongolia University of Technology,Hohhot,010051,China

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2024

10.1016/j.pnsc.2024.07.020

自然科学进展·国际材料(英文)
国家自然科学基金委员会

自然科学进展·国际材料(英文)

影响因子：0.25
ISSN：1002-0071
年,卷(期)：2024.34(5)