摘要
通过DIL805热膨胀仪分别测试了固溶处理加热和保温过程中7A85铝合金的晶粒长大行为,统计分析了加热速率、保温温度和保温时间对α-Al晶粒尺寸的影响,分别建立了加热和保温过程晶粒长大动力学模型。结果表明,7A85铝合金固溶处理过程中晶粒长大行为分为两个步骤:一为加热过程冷轧变形晶粒的静态再结晶行为和长大行为;二为保温过程晶粒的长大行为。加热过程中,加热温度越高,α-Al晶粒尺寸越大;加热速率越快,α-Al晶粒越小。保温过程中,随保温时间的延长,α-Al晶粒尺寸逐步增大,且保温初期的晶粒尺寸长大速率更快。加热过程和保温过程中晶粒的长大动力学模型计算值的相对误差分别为在5%和8%以内,具有较高的计算精度。
Grain growth behavior of 7A85 aluminum alloy during solution treatment heating and holding was tested by using DIL805 dilatometer.Effects of heating rate,holding temperature,and holding time on theα-Al grain size were statistically analyzed,and grain growth kinetic models for the heating and holding were established respectively.The results show that the grain growth behavior of the 7A85 aluminum alloy during solution treatment can be divided into two stages:first,the static recrystallization and growth behavior of cold-rolled deformed grains in the heating stage;second,the grain growth behavior in the holding stage.During the heating stage,the higher the heating temperature,the larger theα-Al grain size;the faster the heating rate,the smaller theα-Al grain size.During the holding stage,as the holding time extends,theα-Al grain size gradually increases,and the grain growth rate is faster in the early stage of holding.The relative errors of the calculation results of the growth kinetic models during the heating and holding stages are within 5%and 8%,indicating a high prediction accuracy.
作者
王军庆
Wang Junqing(Mathematics and Physics Teaching Center,Weifang University of Science and Technology,Weifang Shandong 261000,China)
出处
《金属热处理》
北大核心
2025年第11期55-60,共6页
Heat Treatment of Metals
