Achieving large near-linear elasticity,low modulus,and high strength in a metastable β-Ti alloy by mild cold rolling  

作　　者：Yu Fu Wenlong Xiao Jian Rong Lei Ren Huabei Peng Yuhua Wen Xinqing Zhao Chaoli Ma 

机构地区：[1]Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education,School of Materials Science and Engineering,Beihang University,Beijing 100191,China [2]Scholl of Mechanical Engineering,Sichuan University,Chengdu 610065,China [3]Tianmushan Laboratory,Hangzhou 310023,China [4]Key Laboratory of Mechanics in Fluid Solid Coupling Systems,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Journal of Materials Science & Technology》2024年第22期1-12,共12页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51671012 and 52001018);the Youth Talent Support Program of Beihang University.

摘　　要：Simultaneously achieving high elasticity,low modulus,and high strength in Ti alloy has been a long-standing challenge.In this study,cold rolling was conducted to modulate the martensitic transformation of the Ti-15Nb-5Zr-4Sn-1Fe alloy to address this challenge.The 10%cold rolling process was primarily accommodated by a novel stress-induced sequential β-to-α″-to-α′martensitic transformation accompanied by the disappearance of ω phase,which was sufficient to induce adequate martensite and defects to suppress the initial rapid stress-induced martensitic transformation,without destroying the equiaxed shape of prio rβ grains.Consequently,the novel sequential phase transformation led to a substantial decrease in Young’s modulus by 50.5%while increasing the strength,resulting in an excellent combination of large near-linear elasticity of 2.34%,low modulus of 45 GPa,and high strength of 1093 MPa.The obtained large near-linear elasticity was mainly contributed by the concurrent low modulus and high strength obeying Hooke’s law.These findings provide valuable insights into the attainment of concurrent high elasticity and low modulus in Ti alloys by regulating the stress-induced sequential martensitic transformation.

关 键 词：Titanium alloys Martensitic transformation Young’s modulus Elasticity Mechanical properties 

分 类 号：TG146.23[一般工业技术—材料科学与工程]