7A09铝合金半固态坯料超塑性研究  

Superplasticity Research on Semi-solid Blank of 7A09 Aluminium Alloy

作　　者：黄映霞[1] 王高潮[1] 孙前江[1] 

机构地区：[1]南昌航空大学材料与工程学院,江西南昌330063

出　　处：《热加工工艺》2009年第13期16-18,共3页Hot Working Technology

摘　　要：采用综合热分析(DTA)、扫描电镜(SEM)、能谱分析(EDS)和金相显微镜,研究了7A09铝合金三种状态(原挤材、电磁搅拌法制备半固态和SIMA法制备半固态)下的熔点、表面微区范围组织结构及形貌特征,并在375～500℃温度范围内,对晶粒尺寸在50～80μm之间的半固态坯料进行了最大m值法超塑性拉伸实验。试验结果表明,在400℃时,7A09铝合金原挤材最大伸长率为119%;在450℃时,电磁搅拌法半固态坯料最大伸长率为152%;在400℃时,SIMA法半固态坯料最大伸长率为140%。The melting points and microstructures of 7A09 with three states （original extrusion aluminium, semi-solid blank by electromagnetic stirring, semi-solid blank by SIMA） were researched by DTA, SEM, EDS and quantitative metallography. The superplastic tensile tests of semi-solid blanks ＂with 50 -80 μm grain size were processed within the temperature range 375-500℃ by maximum m method. The results show that the maximum elongation of orginal extrusion aluminium is 119% at 400℃ ; the maximum elongation of semi-solid blank by electromagnetic stirring is 152% at 450℃ and the maximum elongation of semi-solid blank by SIMA is 140% at 400℃.

关 键 词：7A09铝合金 半固态 超塑性 

分 类 号：TG146.21[一般工业技术—材料科学与工程]