摘要
试验研究了铸态LAZ532-2RE合金在温度为398K～448K和压力为60～100 MPa的范围内的压蠕变行为.结果表明,在398、423和448K温度蠕变测试时,应力指数n值分别为4.25、4.98和6.23,蠕变激活能Qc值在60、80和100 MPa的应力条件时分别为104、118和134 kJ/mol,其对应的蠕变机制,应力指数在4.25～4.98之间时,蠕变机制是位错攀移型蠕变.当n大于6时,属于受非基面位错运动控制的蠕变,稀土相在高温蠕变过程中阻碍了位错运动,提高了该合金的高温蠕变性能.
The creep behavior of the extruded LAZ532-2RE 398K- 448K with different stresses between 60,80 and alloy was investigated at temperature in the rang of 100 MPa respectively. The results show that the extruded LAZ532-2RE alloy was performed on creep tests at 398,423 and 448 K, The stress exponent of n varies from 4.25 to 6.23 ,and the activation energy varies from 104kJ/mol to 134kJ/mol. There is a transition between dislocations climb dominated creep mechanism and dislocation creep controlled by non-basal planes slip. The stress exponent is between 4.25 - 4.98, the creep mechanism is dislocation climb creep. When n is higher than 6, which subjected to non-basal dislocation motion-controlled creep. The rare earth phase hindered the dislocation movement, and improved high temperature creep properties of the alloy.
出处
《吉林化工学院学报》
CAS
2013年第5期75-77,共3页
Journal of Jilin Institute of Chemical Technology
关键词
拉伸蠕变
应力指数
激活能
位错
tensile creep
stress exponent
activation energy
dislocation
