摘要
采用雾化-双辊急冷法和热挤压工艺,制备了快速凝固/粉末冶金Mg-6wt%Zn-5wt%Ca合金,研究了合金在150～200℃和压力为30～70MPa的压缩蠕变行为。结果表明,随温度和应力的升高,合金的压蠕变量增大,稳态蠕变速率的对数分别与应力的对数和温度的倒数呈线性关系,稳态蠕变速率符合半经验公式;在175℃时,应力指数n为2.27;在70MPa条件下,表观激活能Qa为133kJ/mol;合金的压蠕变速率由镁的自扩散和位错滑移控制。
The rapidly solidification/powder metallurgy （RS/PM） Mg-6wt% Zn-5wt% Ca alloy in form of rods was prepared by hot extrusion with RS powders. The compressive creep behavior of the alloy was investigated at 150-200℃and different compressive stress of 30-70 MPa. The results show that the creep mass increases with increasing temperature and compressive stress. There is linear logarithmic relationship between steady creep rate and all the temperature and stress used. The steady creep rate obeys an empirical equation. At 175 ℃, the stress exponent is 2.27. And at 70 MPa, the appearance activation energy is 133 kJ/mol. The steady creep rate of the alloy is controlled by Mg self-diffusion and dislocation slip.
出处
《热加工工艺》
CSCD
北大核心
2013年第6期21-23,共3页
Hot Working Technology
基金
重庆理工大学青年基金计划资助项目(2010ZQ30)
重庆市科委自然科学基金计划资助项目(CSTC
2010BB4307)
重庆理工大学基金项目(2009ZD26)
关键词
快速凝固
粉末冶金
镁合金
压缩蠕变行为
应力指数
激活能
rapidly solidified/powder metallurgy（RS/PM）
magnesium alloy
, compressive creep behavior
stress exponent
active energy
作者简介
作者简介：周涛（1981-），男，重庆人，副教授，博士，主要研究方向为高性能镁合金的制备及其微观机理;电话：023-65030023；E-mail：ztlw8118@yahoo．com．cn
