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℃.
出处
《热加工工艺》
CSCD
北大核心
2009年第13期16-18,共3页
Hot Working Technology
关键词
7A09铝合金
半固态
超塑性
7A09 aluminium alloy
semi-solid
superplasticity
