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The hot deformation behavior and processing map of powder metallurgy NiAl-based alloy

Published online by Cambridge University Press:  09 September 2016

Zhenhan Huang ,
Zhen Lu ,
Shaosong Jiang  and
Kaifeng Zhang
Zhenhan Huang
Affiliation:
School of Material Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
Zhen Lu*
Affiliation:
School of Material Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
Shaosong Jiang
Affiliation:
School of Material Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
Kaifeng Zhang
Affiliation:
School of Material Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
*
a) Address all correspondence to this author. e-mail: luzhenhit@hit.edu.cn
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Abstract

Hot deformation is an effective way to tackle major problems in powder metallurgy, i.e., inferior mechanical properties and low relative density. To characterize the hot deformation behavior of NiAl-based alloy manufactured by hot pressing sintering, the isothermal compression tests were performed in the deformation temperature range of 1100–1300 °C with strain rate of 0.001–1 s−1. The result indicates that calculated hot activation energy Q is 326.31 kJ/mol. The processing efficiency maps and instability maps of NiAl-based alloy were established to optimize deformation parameters on the basis of dynamic material model. They were validated through microstructure evolution. The microstructure observation revealed that fine grains, dislocation pile-up, cracks appear in high efficiency, low efficiency, and instability domains, respectively. According to effective processing window revealed by processing maps, hot forging of sintered billets was performed. The elevated temperature elongation increases from 17.86% to 74.87% after forging. The stripping feature is found on fracture surface after forging.

Keywords

NiAl-based alloydeformation behaviorprocessing mapmicrostructure evolutionforging
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 19 , 14 October 2016 , pp. 2964 - 2976
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Copyright
Copyright © Materials Research Society 2016 

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