Accelerated stress relaxation with simultaneously enhanced strength of titanium alloy by phase transformation and stress-induced twinning

Wang，Kehuan1,2; Qu，Bao1,2; Zhao，Jie1,2; He，Binbin3; Liu，Gang1,2

2024

10.1016/j.scriptamat.2023.115761

Scripta Materialia   Impact Factor & Quartile

1359-6462

1872-8456

Stress relaxation with synchronous aging for titanium alloys was proposed to reduce the stress relaxation limit and enhance the mechanical strength simultaneously. Stress relaxation tests at 600 °C of solution treated sample and aged sample were performed to study the interplay between microstructure evolution and stress relaxation. Kohlrausch-Williams-Watts equation was employed to analyze the relaxation kinetics. Results show that the applied stress promotes the rapid precipitation and growth of the α (secondary α) phase. Meanwhile, the applied stress also induces the presence of twinning in the α phase, leading to the relaxation of the elastic energy in the α. In return, both phase transformation and stress-induced twinning reduce the stress relaxation limit by 56 %. Moreover, the tensile strength of Ti-6.5Al-2Zr-1Mo-1 V alloy at room and service temperature was improved by 3.4 % and 9.2 %, respectively.

Mechanical properties Phase transformation Stress relaxation Stress-induced twinning Titanium alloy

SCI

English

Others

China Postdoctoral Science Foundation[2021T140153];National Natural Science Foundation of China[U1937204];

Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:001078662300001

PERGAMON-ELSEVIER SCIENCE LTD

MATERIALS SCIENCE

2-s2.0-85170524956

Scopus

1.National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin,150001,China
2.Institute of High Pressure Fluid Forming,Harbin Institute of Technology,Harbin,150001,China
3.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Wang，Kehuan,Qu，Bao,Zhao，Jie,et al. Accelerated stress relaxation with simultaneously enhanced strength of titanium alloy by phase transformation and stress-induced twinning[J]. Scripta Materialia,2024,238.

Wang，Kehuan,Qu，Bao,Zhao，Jie,He，Binbin,&Liu，Gang.(2024).Accelerated stress relaxation with simultaneously enhanced strength of titanium alloy by phase transformation and stress-induced twinning.Scripta Materialia,238.

Wang，Kehuan,et al."Accelerated stress relaxation with simultaneously enhanced strength of titanium alloy by phase transformation and stress-induced twinning".Scripta Materialia 238(2024).