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High-pressure and high-temperature sintering of nanostructured bulk NiAl materials

Published online by Cambridge University Press:  31 January 2011

Shanmin Wang ,
Duanwei He ,
Yongtao Zou ,
Jianjun Wei ,
Li Lei ,
Yongjun Li ,
Jianghua Wang ,
Wendan Wang  and
Zili Kou
Duanwei He*
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People's Republic of China
Zili Kou
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People's Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Nanostructured bulk NiAl materials were prepared at high pressure and temperature (0–5.0 GPa and 600–1500 °C, respectively). The sintered samples were characterized by x-ray diffraction, scanning electron microscope, density, and indentation hardness measurements. The results show that NiAl nanoparticles may have a compressed surface shell, which may be the reason why NiAl nanomaterials were difficult to densify sintering using conventional methods and why high-pressure sintering was an effective approach. We also observed that B2-structured NiAl could undergo a temperature-dependent phase transition and could be transformed into Al0.9Ni4.22 below 1000 °C for the first time. It is interesting to note that Vickers hardness decreased as grain size decreased below ∼30 nm, indicating that the inverse Hall-Petch effect may be observed in nano-polycrystalline NiAl (n-NiAl) samples. Moreover, a tentative interpretation was developed for high-pressure nanosintering, based on the shell-core model of nanoparticles.

Keywords

Grain sizeNanostructureSintering
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 6 , June 2009 , pp. 2089 - 2096
Copyright
Copyright © Materials Research Society 2009

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