摘要
试验研究了铸态LA141合金在温度为30～85℃和压力为37.3～74.6MPa的范围内的压蠕变行为。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对数和温度呈较好的线性关系,稳态蠕变速率符合半经验公式。在不同的温度下,应力指数n相近,平均值为3.16;不同的应力下,表观激活能Qa相差不大,平均值为104.1kJ/mol,材料结构常数A为2.68×105,稳态蠕变速率由Li的点阵自扩散和位错的攀移过程所控制。
The compressive creep behavior of an as-cast LA141 Mg-Li alloy was investigated at temperature in the rang of 30-85 ℃ and different compressive stresses between 37.3 MPa and 74.6 MPa. The results show that the creep increases with the increasing of temperature and compressive stress. There is linear logarithmic relationship between the steady creep rate and all the temperature and stress used. The steady creep rate obeys an empirical equation. The stress exponents are similar at different temperatures and the appearance activation energies are not greatly different under different stresses, the average values are 3.16 and 104.1 KJ/mol respectively. Materials constant A is 2.68 × 10^5, the rate of steady creep is controlled by self-diffusion of Li and by a dislocation climb.
出处
《铸造》
EI
CAS
CSCD
北大核心
2005年第11期1079-1081,共3页
Foundry
