Effect of annealing temperature on microstructure and hardness of aluminum bronze

doi:10.13251/j.issn.0254-6051.2020.03.037

Abstract

Abstract:

The evolution of microstructure and hardness of the Cu-Al-Ni alloy during cold-rolling and annealing were investigated by using optical microscopy, scanning electron microscopy, XRD and Vickers hardness tester. The effect of annealing temperature on annealing softening of the Cu-Al-Ni alloy was analyzed. The results show that the microstructure of Cu-Al-Ni alloy after water quenching at 950 ℃ consists of α phase matrix with fcc structure and β phase with bcc structure. The β distributed at grain boundary has small effect on hardness. The hardness significantly increases to 270 HV0.5 in the alloy after cold rolling due to the increase of dislocation strengthening effect. An obvious softening occurs in the cold-rolled Cu-Al-Ni alloy after annealing above 400 ℃, which is attributed to the decrease in dislocations resulted from the recrystallization process. In addition, the recrystallization temperature of the Cu-Al-Ni alloy is above 300 ℃, which is higher than that of pure copper. It is indicated that the addition of Ni and Al could significantly increase the recrystallization temperature and improve the softening resistance.

Key words: aluminum bronze, annealing temperature, microstructure, hardness, softening

CLC Number:

TG146.1

Xie Weibin, Liu Gang, Luo Fuxin, Zhou Zhongming, Yang Zhen. Effect of annealing temperature on microstructure and hardness of aluminum bronze[J]. HTM, 2020, 45(3): 191-195.

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