摘要
用元素分配比计算了ＣＭＳＸ－２合金树枝状晶各典型区域（枝晶干、枝晶臂及枝晶间）γ和γ’的相成分，用Ｗａｎｔａｎａｂｅ公式求得相应区域γ和γ’的点阵常数，由此算得各区域所对应的室温错配度．用Ｌｉｎｋ关于温度与应力综合作用对错配度影响的公式计算了持久变形过程的错配度，解释了该合金在室温无外应力至高温＋外应力作用时错配度符号及大小的变化．枝晶各区域错配度的变化与各区成分的变化和各区、各相中Ｔａ／Ｗ比以及显微硬度（ＨＶ）的变化有显著对应关系．
Chemical compositions of gamma and gamma' phases in typical regions of dendritic structure of CMSX-2 are calculated with use of partitioning ratios of the alloying elements. Room temperature lattice constants and corresponding lattice misfits of the two phases are found through the application of Wantanabe's equation and general misfit equation, respectively. Lattice misfits of the two coherency phases during prolonged tensile tests are calculated by using the Link's equation for the comprehensive effect of temperature and applied stress on the lattice misfit. The calculation results well explain the change of the sign and the magnitude of the lattice misfits under the undeformed and the creep-deformed to rupture conditions. Evident relationships of the misfit change in the typical regions to the composition, phase composition, ratio of Ta/W and micro-hardness (HV) in the corresponding dendritic regions are demonstrated though both calculation and experimentation. The lattice misfit change and its changing rate caused by the chemical composition change affect directly the rupture life of the alloy.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第2期171-178,共8页
Acta Metallurgica Sinica
基金
国家教育部高等院校骨干教师资助项目
