欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
采用光学显微镜、透射电子衍射和扫描电子衍射显微分析技术，结合力学性能检测和电导率测定的方法，研究双级固溶温度和时间对7A55铝合金板材力学性能的影响。结果表明：最佳双级固溶制度为450℃，90min＋485℃，40min。采用该固溶制度经120℃，24h时效后，板材的拉伸力学性能达到σb=648．4MPa．σ0.2=629．6MPa及δ=11．9％。第一级固溶制度是影响板材力学性能的主要因素，最佳固溶温度为450℃。在450℃进行第一级固溶后，样品发生了较强的回复，由于降低了再结晶驱动力，第二级高温固溶在获得较高的合金元素过饱和度的同时，仅发生较少的再结晶，从而在随后的时效过程中产生更高的析出强化效应。
英文摘要：
The effects of temperature and time of two-stage solution on mechanical properties of 7A55 aluminium alloy sheet were investigated by optical microscopy, TEM and SEM analyses and tensile testing and electrical conductivity test. The optimal two-stage solution treatment is 450 ℃, 90 min＋485 ℃, 40 min. The mechanical properties σ, σ0.2 and δ reach 648.4 MPa, 629.6 MPa and 11.9%, respectively, after aging at 120 ℃ for 24 h. The results show that the first stage solution is crucial to the mechanical properties, and the optimal temperature is 450 ℃. The extensive recovery occurs after the first stage solution at 450 ℃, which reduces the driving force of recrystallization. Consequently, higher alloying elements supersaturation in matrix is obtained at the second stage high temperature solution and only little recrystallization happens. As a result, a better precipitation strengthening effect in subsequent aging is attained.
同期刊论文项目
同项目期刊论文
期刊信息
位置：