Effect of aging treatment on phase transformation thermal stability of Ni-Ti-Hf-Nb high temperature shape memory alloy

doi:10.13251/j.issn.0254-6051.2023.07.010

Abstract

Abstract: Effect of aging treatment on martensitic phase transformation behavior and thermal cycling stability of (Ni₅₀Ti₃₅Hf₁₅)₉₀Nb₁₀ high temperature shape memory alloy were investigated by combining differential scanning calorimetry, microhardness, and energy spectrum analysis. The results show that during aging treatment at 450 ℃, both the austenite phase transformation peak temperature (Ap) and martensite phase transformation peak temperature (Mp) of the experimental alloy increase first and then decrease with the extension of aging time. During aging treatment at 550 ℃ and 650 ℃, as the aging time increases, both the Ap and Mp gradually decrease. The phase transformation temperatures decrease more significantly during aging at 650 ℃ compared to aging at 550 ℃. The specimen aged at 550 ℃ for 1 h exhibits the best thermal cycling stability, with ΔAp and ΔMp of 1.5 ℃ and 5.8 ℃, respectively, after 10 thermal cycles.

Key words: high temperature shape memory alloy, aging treatment, thermal cycle stability, thermal analysis

CLC Number:

TG166.5

Zhao Guojian, Li Haoyuan, Yang Jie, Xu Ruiyao, Huang Xingmin, Jin Mingjiang. Effect of aging treatment on phase transformation thermal stability of Ni-Ti-Hf-Nb high temperature shape memory alloy[J]. Heat Treatment of Metals, 2023, 48(7): 54-60.

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