Research progress on hardening effect and mechanism during annealing of metals

doi:10.13251/j.issn.0254-6051.2021.09.001

Abstract

Abstract: Softening of metals could be achieved during annealing, generally. However, for several specific metals or alloys, the abnormal phenomenon of annealing hardening occurred. The phenomenon and mechanism of hardening effect during annealing in pure metal, Cu alloy, Ni-W alloy, Zn-Al alloy and Al alloy were summarized. It was noted that the annealing hardening could be detected for the as-cast Al-Sc, Al-Yt and Al-Zr alloys, while cold deformation was necessary for the other types of alloys to obtain the annealing hardening. The mechanisms of annealing hardening were summarized as follows, including solute segregation on grain boundary, grain boundary relaxation, grain boundary nailing of the second phase particles, dislocation source-limited hardening, pinning effect of segregated solute atoms on twin boundary migration or dislocation sliding, annealing twins and strengthening of the second phase nanoparticles, etc.

Key words: annealing hardening, hardening mechanism, cast alloy, plastic deformation

CLC Number:

TG156.2

Wu Hao, Gan Zhanghua, Lao Wenjie, Wu Chuandong, Wang Jiamin, Ni Qian. Research progress on hardening effect and mechanism during annealing of metals[J]. Heat Treatment of Metals, 2021, 46(9): 1-6.

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