【作者】 李杰； 尹志民； 黄继武； 王涛；

【Author】 Li Jie, Yin Zhimin, Huang Jiwu, Wang Tao( School of Material Science and Engineering, Central South University, Changsha 410083, China; Northeast Light Alloy Co. Ltd. , Harbin 150060, China)

【机构】 中南大学材料学院；

【摘要】 采用圆柱试样在Gleeble-1500热模拟机上进行恒温和恒速压缩变形实验,变形温度范围为350～450℃.应变速率范围为0.001～0.1s-1。研究了7055铝合金在高温塑性变形过程中流变应力的变化规律,确定了合金的变形激活能Q和应力指数n。结果表明,流变应力随变形温度的升高而降低,随应变速率的提高而增大。可用应力-应变速率方程来描述7055铝合金高温压缩变形时的热变形行为。这种合金在350—450℃温度范围内的热变形组织为发生了动态回复并伴随有少量再结晶的组织。更多还原

【Abstract】 The mechanical behavior of 7055 aluminum alloy during high temperature plastic deformation was studied by isothermal compression of cylindrical specimen using gleeble-1500 at constant temperature and constant strain rate. The deformation temperature ranges from 350 to 450 ℃, strain rate from 0.001 to 0.1 s -1. The thermal deformation activation energy Q and stress exponent n were calculated, and the hot deformation micro-structure were observed. The re-sults show that the flow stress is controlled by both strain rate and deforming temperature, the flow stress decreases with the increase of deforming temperature, while increases with the increase of strain rate. The hot deformation behavior of 7055 aluminum alloy compressed under high temperature can be represented by stress-strain rate equation. Dynamic recovery structure together with a few recrystallizaion structure are observed after hot deformed at 350 - 450 ℃.更多还原