Effect of solution treatment on electrical properties and yield strength of Ni-Cr-Al-Fe alloy

doi:10.13251/j.issn.0254-6051.2020.05.012

Abstract

Abstract: The effects of solution temperature and time on the grain size, resistivity, TCR and yield strength of the precision resistance alloy wire were examined. Also, the properties of as-quenched and as-aged alloys were compared. The results show that the resistivity increases with the increase of solution temperature and holding time, while the TCR decreases. Both the variations are useful to improve the electrical properties of the alloy. The activation energy of grain boundary migration is 674.25 kJ/mol, and the comprehensive dynamic equation of grain growth is as follow: D-^3.3_t=3.80×10³⁰texp-8.11×10⁴T. The relationship between yield strength and grain size of this alloy is deduced to be Rp0.2=341.19+354.64D^-0.5_t. After solid solution at 950 ℃ for 7.5 min and aging at 430 ℃ for 0.5 h, the yield strength, resistivity and TCR are 445 MPa, 132.2 μΩ·cm and 2.2 × 10^-6℃^-1, respectively. And thus the alloy is suitable to be used as precision resistance component.

Key words: solid solution process, precision resistance alloy, resistivity, temperature coefficient of resistance, grain size, yield strength

CLC Number:

TG132.2

Yu Wenxin, Wang Yong, Yang Xianjun, Xu Yonghong, Wu Da, Wang Fenghong. Effect of solution treatment on electrical properties and yield strength of Ni-Cr-Al-Fe alloy[J]. Heat Treatment of Metals, 2020, 45(5): 62-68.

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