Size-dependent deformation mechanisms in two-phase γ-TiAl/ α2-Ti3Al alloys

被引：1

作者：

Wang, Shiping ^{[1
]}

Zhou, Xiong ^{[1
]}

Lu, Zhongtao ^{[1
]}

Huang, Xiege ^{[1
]}

He, Li ^{[1
]}

Feng, Xiaobin ^{[1
]}

Li, Wenjuan ^{[1
]}

Zhai, Pengcheng ^{[1
,2
]}

Li, Guodong ^{[1
,2
]}

机构：

[1] Wuhan Univ Technol, Sch Sci, Hubei Key Lab Theory & Applicat Adv Mat Mech, Wuhan 430070, Peoples R China

[2] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

来源：

SCRIPTA MATERIALIA | 2025年 / 254卷

基金：

中国国家自然科学基金;

关键词：

Phase boundary; Domain boundary; Ultimate strength; HIGH-TEMPERATURE; INTERFACES;

D O I：

10.1016/j.scriptamat.2024.116330

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Polysynthetic twinned (PST) TiAl single crystals, consisting of alternating layers of gamma-TiAl and alpha 2-Ti3Al, exhibit excellent mechanical properties. However, size-dependent deformation mechanisms have not yet been fully elucidated. In this work, we investigated the deformation process of two-phase gamma-TiAl/alpha 2-Ti3Al alloys with different layered sizes via uniaxial tensile loading using molecular dynamics simulations. The results show that with the decreasing phase boundary (PB) spacing 7 or domain boundary (DB) spacing d, the excess free volume at the intersection of DB and PB decreases, leading to increased yield stress. We found that a higher interface density (smaller 7 or d) can accommodate more dislocations, and the size-dependent ultimate strength follows an approximate Hall-Petch relation. These findings offer an essential understanding for the size-dependent PST TiAl single crystals with high strength.

引用

页数：6

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