Deformation of lamellar TiAl alloys by longitudinal twinning

被引：56

作者：

Edwards, Thomas Edward James ^{[1
]}

Di Gioacchino, Fabio ^{[1
]}

Munoz-Moreno, Rocio ^{[1
]}

Clegg, William John ^{[1
]}

机构：

[1] Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England

来源：

SCRIPTA MATERIALIA | 2016年 / 118卷

基金：

英国工程与自然科学研究理事会;

关键词：

Titanium aluminide; Twinning; Microindentation; Electron backscattering diffraction (EBSD); Digital image correlation; PST CRYSTAL; FRACTURE; BOUNDARIES; CREEP; PHASE;

D O I：

10.1016/j.scriptamat.2016.03.004

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The occurrence of longitudinal twinning in the engineering alloy Ti-45Al-2Nb-2Mn (at.%)-0.8 vol.% TiB2 has been studied by measuring the changes in crystallographic orientation within individual lamellae during microcompression. Twinning in this alloy appeared to be a nucleation-limited process with the twins growing from lamellar boundaries at resolved shear stresses as low as 100 MPa, consistent with observations elsewhere. However, instead of forming twins similar to 10-200 nm in thickness, as in polysynthetically twinned crystals, the longitudinal twins in this alloy were initiated at a lamellar boundary and then spread through the whole lamella. (C) 2016 Elsevier Ltd.

引用

页码：46 / 50

页数：5

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