作　　者： ; ; ;

机构地区： 广东工业大学材料与能源学院

出　　处： 《广东有色金属学报》 2004年第1期44-47,共4页

摘　　要： 在Gleeble-1500热模拟试验机上,采用高温等温压缩法,研究了7075铝合金在250～450℃温度范围及1.0～0.001 s^(-1)应变速率范围内压缩变形时流变应力的变化规律。结果表明,应变速率和变形温度对合金流变应力的影响很大,流变应力随应变速率的提高而增大,随变形温度的提高而降低;其流变应力值可用Zener-Hollomon参数来描述。从流变应力、应变速率和温度的相关性,得出了该合金高温变形的应力指数n,应力水平参数α,结构因子A和变形激活能Q。 Flow stress of 7075 aluminum alloy in the temperature range of 250 - 450℃C and strain rate range of 1.0 -0.001 s^(-1) was studied by isothermal compression test with Gleeble-1500 machine. The results show that flow stress is controlled by strain rate and deformation temperature, the flow stress increases with strain rate increase, but decreases with temperature raise, and the flow stress of 7075 aluminum alloy during high-temperature deformation can be described by Zener-Hollomon parameter. Stress index n, stress scale parameter α, structural factor A, and activation enthalpy Q of the alloy during plastic deformation at high temperature were derived from the correlativity of flow stress, strain rate, and temperature.

关 键 词： 铝合金 流变应力 等温变彤 热模拟试验机 等温压缩

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]