Deformation of lamellar TiAl alloys by longitudinal twinning

SCRIPTA MATERIALIA

卷:118

Article

Edwards, Thomas Edward James¹  Di Gioacchino, Fabio¹  Munoz-Moreno, Rocio¹  Clegg, William John¹ 

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

关键词: Titanium aluminide;    Twinning;    Microindentation;    Electron backscattering diffraction (EBSD);    Digital image correlation;   

DOI  :  10.1016/j.scriptamat.2016.03.004

来源: Elsevier

【 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.

【 授权许可】

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