亚稳态ARB-Cu的微观结构与力学行为对退火工艺的响应关系

doi:10.13251/j.issn.0254-6051.2021.02.007

摘要/Abstract

摘要： 为研究退火热处理对累积叠轧法(ARB)制备的亚稳态超细晶纯铜的微观结构和力学性能的影响,在100~250 ℃内对ARB-Cu分别退火10、30及60 min。通过透射电镜(TEM)、扫描电镜(SEM)、显微硬度计和万能力学试验机对ARB-Cu的微观结构、力学性能以及断口形貌进行了分析。结果表明:随着退火温度的升高,ARB-Cu晶粒尺寸略有长大,亚晶粒弥散分布,位错密度逐渐降低,晶粒形状由不规则态转变为等轴晶粒。ARB-Cu在100~250 ℃分别退火10 min和30 min后,屈服强度和抗拉强度随着退火温度升高呈现先升高后降低的变化趋势。显微硬度随退火温度升高和退火时间增加逐渐下降。在150 ℃退火30 min,ARB-Cu的强度和塑性达到退火态最优匹配。ARB-Cu的断裂机理由叠轧态的解理断裂逐渐变为退火态的韧性断裂,其塑性变形能力得到改善。

关键词: 累积叠轧, 超细晶纯铜, 退火, 微观结构, 力学行为, 断口形貌

Abstract: Metastable ultrafine grained pure Cu was prepared by accumulative rolling bonding (ARB) and annealed at 100-250 ℃ for 10, 30 and 60 min respectively in order to study the effect of annealing heat treatment on its microstructure and mechanical properties. The microstructure, mechanical properties and fracture morphologies were analyzed by means of transmission electron microscopy (TEM), scanning electron microscopy (SEM), Vickers hardness tester and universal mechanical testing machine. The results show that, as the annealing temperature increases, the ARB-Cu grain size increases slightly, the sub-grains are dispersively distributed, the dislocation density decreases gradually, and the grain shape changes from irregular to equiaxed. After annealing at 100-250 ℃ for 10 min and 30 min, the yield strength and tensile strength of the ARB-Cu increase first and then decrease with the increase of annealing temperature. The microhardness gradually decreases with the increase of annealing temperature and annealing time. Annealing at 150 ℃ for 30 min, the strength and plasticity of the annealed ARB-Cu reach the best match. The fracture mechanism of the ARB-Cu changes from cleavage fracture in preparation state to ductile fracture in annealed state gradually, and the plastic deformation ability is improved.

Key words: accumulative rolling bonding, ultrafine grained pure Cu, annealing, microstructure, mechanical behavior, fracture morphology

中图分类号:

TG146.1

李小红, 姜庆伟, 李敏, 杨鹏. 亚稳态ARB-Cu的微观结构与力学行为对退火工艺的响应关系[J]. 金属热处理, 2021, 46(2): 37-44.

Li Xiaohong, Jiang Qingwei, Li Min, Yang Peng. Response of microstructure and mechanical behavior of metastable ARB-Cu to annealing process[J]. Heat Treatment of Metals, 2021, 46(2): 37-44.

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