Unusual martensitic strain accommodation mechanism in an electron beam processed metastable β-Ti alloy

Huang，Yuhe1,2,3; Hernandez-Nava，Everth3; Hu，Xiaogang1,2; Todd，Iain3; Zhu，Qiang1,2

2023-01-15

10.1016/j.scriptamat.2022.115069

SCRIPTA MATERIALIA   Impact Factor & Quartile

1359-6462

This study reports an unusual martensitic strain accommodation mechanism, in an electron beam processed metastable β-Ti alloy, exhibiting a fine-grained microstructure with good yield strength and elastic modulus matching. Microstructural analysis reveals that ultra-fine laths of martensites were embedded within the fine-grained β structure. Detailed TEM and orientation relationship analyses further unravel that the observed microstructure consists of α’’ martensites associated with different habit plane and transformation twins, one with {7100}//{755} type habit plane and forming {111} type I twin while another with {471}//{443} type habit plane, forming a {351}<2¯11> type II twin. This structure can be interpreted as the product of rapid solidification and thermal stress relaxation which manipulated the formation of distinct martensites that originates from the fluctuated lattice instability, lattice distortion, and transformation strain. This finding provides an alternative route for utilizing the martensitic strain accommodation mechanism, benefiting additive manufacturing β-Ti alloy components with desired mechanical performance.

Additive manufacturing Martensite Metastable beta titanium alloy Transformation twins

English

First ; Corresponding

Basic and Applied Basic Research Foundation of Guangdong Province[2021A1515110348];Engineering and Physical Sciences Research Council[EP/P006566/1];Science, Technology and Innovation Commission of Shenzhen Municipality[KQTD20170328154443162];Science, Technology and Innovation Commission of Shenzhen Municipality[ZDSYS201703031748354];

MATERIALS SCIENCE

2-s2.0-85138469377

Scopus

1.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials,China
3.Department of Materials Science and Engineering,University of Sheffield,Sheffield,S1 3JD,United Kingdom

Huang，Yuhe,Hernandez-Nava，Everth,Hu，Xiaogang,et al. Unusual martensitic strain accommodation mechanism in an electron beam processed metastable β-Ti alloy[J]. SCRIPTA MATERIALIA,2023,223.

Huang，Yuhe,Hernandez-Nava，Everth,Hu，Xiaogang,Todd，Iain,&Zhu，Qiang.(2023).Unusual martensitic strain accommodation mechanism in an electron beam processed metastable β-Ti alloy.SCRIPTA MATERIALIA,223.

Huang，Yuhe,et al."Unusual martensitic strain accommodation mechanism in an electron beam processed metastable β-Ti alloy".SCRIPTA MATERIALIA 223(2023).