借助拉伸试验、维氏显微硬度测试、TEM与EBSD等表征手段,研究了限制模压变形道次与变形后退火对纯铝板材微观组织与力学性能的影响规律.经过多道次的限制模压变形,材料晶粒尺寸由初始退火态的约30 μm细化至亚微米级,强度、硬度显著提高.在回复阶段变形材料出现退火强化现象,且在300℃退火时仍保持良好的热稳定性.超细晶材料的退火强化现象主要由晶界位错源抑制强化引起,并与退火温度和应变累积量密切相关.材料晶粒组织在变形及退火过程中主要以小角度晶界为主,且应变累积的不均匀性始终存在.变形后期表面微裂纹的出现对材料的力学性能造成不良影响.2道次模压变形板材在300℃下退火1h后的综合性能最优.
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