Al2O3-弥散强化铜合金的退火行为研究

doi:10.3969/j.issn.1000-1093.2017.11.019

摘要/Abstract

摘要： 采用原位反应合成技术制备了Cu-1.12wt%Al₂O₃合金。通过力学性能测量、断口形貌观察及显微组织结构表征，系统研究了该合金的退火行为。结果表明：对冷拉拔变形量为50%的合金进行退火处理后，合金的硬度和强度均随着退火温度的提高呈缓慢下降趋势，合金韧性得到改善；合金表现为韧性断裂，且随着退火温度的升高，韧窝尺寸和深度增大，内部布满细小的纳米Al₂O₃颗粒；退火态合金位错密度低于冷拉拔态情形、中温退火（873 K）时合金组织以变形位错胞组织和位错墙为主，高温退火（1 223 K）后出现亚晶组织，偶可见亚晶合并、长大并发展成为原始再结晶核心的过程，但由于纳米Al₂O₃颗粒的钉扎位错作用和抑制再结晶效应，基体中仍未发现有明显的再结晶组织存在，合金展示出优异的抗高温软化性能。

关键词: 复合材料, Cu-1.12wt%Al₂O₃合金, 退火行为, 力学性能, 显微组织

Abstract: Cu-1.12wt%Al₂O₃ alloy is fabricated by in-situ reactive synthetic technology, and its annealing behaviors are studied by means of mechanical property measurement, fracture morphology observation and microstructure representation, respectively. The results show that the Rockwell hardness and strength of Cu-1.12wt%Al₂O₃ alloy with cold drawing deformation of 50% slightly decrease with the increase in annealing temperature, and its toughness is also improved. The fracture mechanism of the alloy is a typical ductile fracture, the size and depth of dimple increase with the increase in annealing temperature, and many tiny alumina particles are bestrewn inside dimple. The dislocation density of annealed alloy is lower than that of cold-drawn alloy. The alloy microstructure is mainly composed of deformation dislocation cells and dislocation walls at intermediate annealing temperature (873 K). After high temperature annealing (1 223 K), the subgrain structure is formed, and the merging, growth and development of subgrains can be found to be a process of original recrystallization. As a result of the dislocation of fine alumina particles and grain boundary motion, no obvious recrystallized grains exist in the matrix. The Cu-1.12 wt%Al₂O₃ alloy has a high softening resistance at elevated temperature. Key

Key words: compositematerial, Cu-1.12wt%Al₂O₃alloy, annealingbehavior, mechanicalproperty, microstructure

中图分类号:

张雪辉，谢臣珍，李晓闲，刘位江，杨凯，蒋苗，祝绳健. Al₂O₃-弥散强化铜合金的退火行为研究[J]. 兵工学报, 2017, 38(11): 2220-2225.

ZHANG Xue-hui， XIE Chen-zhen, LI Xiao-xian， LIU Wei-jiang， YANG Kai， JIANG Miao， ZHU Sheng-jian. Research on Annealing Behaviors of Al₂O₃-Dispersion Strengthened Copper[J]. Acta Armamentarii, 2017, 38(11): 2220-2225.

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第11期2017 年11月兵工学报ACTA
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Al₂O₃-弥散强化铜合金的退火行为研究

Research on Annealing Behaviors of Al₂O₃-Dispersion Strengthened Copper

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