超高强铝合金7A04高温流变行为的研究  

Study on flow deformation behavior of high strength aluminum alloy 7A04 at elevated temperature

作　　者：郭小艳[1] 肖艳红[1] 兰辉 刘汉雄 郭成[1] 

机构地区：[1]西安交通大学机械工程学院,陕西西安710049 [2]陕西秦川机械发展股份有限公司,陕西宝鸡721009 [3]西北工业集团有限公司,陕西西安710043

出　　处：《锻压技术》2011年第4期138-142,共5页Forging & Stamping Technology

摘　　要：通过在Gleeble-1500热模拟实验机上对7A04铝合金进行高温压缩实验,研究了该合金变形温度在300～450℃,应变速率在0.01～10 s-1范围内的高温流变变形行为。结果表明:流变应力随变形温度的升高而降低,随着应变速率的增加而升高。建立了一个综合考虑应变、温度、应变速率三者影响的流变应力方程,预测值与拟合实验值非常接近,结果表明:该流变应力方程用来预测7A04铝合金材料一般加载情况下的热成形过程是比较可靠的。The elevated temperature flow deformation behavior of 7A04 aluminum alloys was studied by thernal compression test at the temperature of 300-500 ℃ and at strain rate of 0.01-10 s-1 with Gleeble-1500 thermal simulator.The results show that the flow stress increases with the increase of strain rate and decreases with the increase of deformation temperature.A flow stress equation incorporating the effects of temperature,strain rate and strain was proposed.Comparisons between the experimental and predicted results were satisfactory,which confirms that the flow stress equations can be used in computer code to model the hot forming process of 7A04 aluminum alloy part under the prevailing loading conditions.

关 键 词：流变应力方程 热压缩实验 热成形 

分 类 号：TG146.21[一般工业技术—材料科学与工程]