摘要
采用自制的压蠕变试验装置研究了锆对ZA2 7合金压蠕变行为的影响。结果表明 ,在试验温度 2 0℃～ 1 60℃和压应力 50MPa～ 1 37 5MPa范围内 ,ZA2 7 Zr和ZA2 7合金压蠕变第一阶段的变形量和稳态蠕变速率随着温度和应力的增高而增大 ,但在 1 0 0℃以下时 ,ZA2 7 Zr合金第一阶段的蠕变量及稳态蠕变速率低于ZA2 7合金 ,合金的压蠕变抗力高于ZA2 7合金 ,在 1 60℃则相反。合金的压蠕变行为可用等式 :lnt=C -nlnσ +Q RT表达 ,其中 ,材料结构常数C不同导致两种合金的蠕变行为不同。ZA2 7 Zr合金的应力指数n和蠕变激活能Q分别为 3 63和 87 32kJ·mol-1 ,ZA2 7合金的应力指数和蠕变激活能分别为 3 46和 81 0 9kJ·mol-1 。表明Zr的加入并不影响ZA2 7合金的蠕变机制 。
Effect of Zr on the compressive creep behavior of ZA27 alloy is investigated with special apparatus. The results show that the primary compressive creep strain and steady creep strain rates of ZA27\|Zr and ZA27 alloys increased with increasing the temperature and stress.The primary compressive creep strain and steady creep strain rates of ZA27 Zr were lower than that of the ZA27 alloy below 100℃, and higher at 160℃. The compressive creep of ZA27\|Zr and ZA27 alloys obeys an empirical equation ln t=C-n ln σ+Q/RT, in which the exponent stress n and the activation energy Q are 3 63 and 87 32 kJmol -1 for ZA27\|Zr, and 3 46 and 81 09 kJmol -1 for ZA27, respectively. The different material structure constant C associated with the different compressive creep behavior. The addition of Zr does not influence the compressive creep mechanism of ZA27 alloy, which is controlled by the lattice diffusion of zinc and dislocation limb.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2003年第1期45-48,54,共5页
Transactions of Materials and Heat Treatment
关键词
ZA27合金
锆
压蠕变行为
蠕变机制
ZA27 alloy
Zr
compressive creep behavior
creep mechanism
