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

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Transactions of Nonferrous Metals Society of China

Vol. 22    No. 7    July 2012

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Effect of heat treatment on tensile deformation behavior of Ni-Co film/Fe substrate systems
ZHANG Min-jie1,2, PAN Yong1,2, ZHOU Zhao-feng1,2, LI Wei1,2, HUI Jian-ke1,2, LEI Wei-xin1,2

1. Faculty of Materials and Optoelectronics Physic, Xiangtan University, Xiangtan 411105, China;
2. Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education,
Xiangtan University, Xiangtan 411105, China

Abstract:The effects of heat treatment on microstructure and tension property of Ni-Co film/Fe substrate systems were investigated. The deformation and fracture morphologies of Ni-Co films/Fe substrate systems were studied by in-situ scanning electron microscopy (in-situ SEM) before and after heat treatment. The results show that a Ni-Co/Fe diffusion layer appears between the film and substrate after heat treatment; the elongation of film/substrate system increases with increasing the heat treatment temperature. Both the strength and ductility of the film/substrate system are preferable when heat treatment temperature is 650 oC, meanwhile the maximum elongation is up to 46%. During tensile deformation, the deformation behaviors of Ni-Co film/Fe substrate are quite different before and after heat treatment. The samples after heat treatment went through the progress of holes’ emergence, growth and extension, whereas the samples without heat treatment accompanied with no holes, just cracked instead, showing that appropriate heat treatment is helpful to improve the toughness of material, and mechanical properties.


Key words: heat treatment; Ni-Co alloy; tensile deformation; fracture

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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