Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 26    No. 3    March 2016

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Thermal deformation behavior and mechanism of intermetallic alloy Ti2AlNb
Qin-chai ZHANG1, Ming-he CHEN1, Hui WANG1, Ning WANG1, Jin-dong OUYANG2, Xin-xiao LI3

1. College of Mechanical and Electrical Engineering,
Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. Jiangxi Hongdu Aviation Industry Group Co., Ltd., Nanchang 330024, China;
3.Xi’an Aero Engine (Group) Co., Ltd., Xi’an 710021, China

Abstract:The deformation behavior and mechanism of Ti2AlNb-based alloy were experimentally investigated at elevated temperatures. Firstly, the stress-strain relationships at different temperatures and strain rates were investigated via uniaxial tensile testing. Then, formability data, as determined by examining the deep drawing and bending abilities, were obtained through limiting draw ratio (LDR) and bending tests. Finally, metallographic experiments and fracture morphology investigations were conducted to examine the thermal deformation mechanism of the alloy. The results showed that as the temperature increased, the total elongation increased from 13.58% to 97.82% and the yield strength decreased from 788 to 80 MPa over the temperature range from 750 to 950 °C at a strain rate 0.001 s-1. When the temperature reached 950 °C, the strain rate was found to have a great influence on the deformation properties. The plastic formability of the sheet metal was significantly improved and a microstructuraltransformation of O to B2 and α2 occurred in this temperature region, revealing the deformation mechanism of its plasticity.

 

Key words: Ti2AlNb-based alloy; deformation behavior; deformation mechanism; formability

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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