采用自制的实验装置研究了稀土(Ce≥45%)对ZA27合金在常温及高温时的压蠕变行为的影响.研究表明,在所试验的温度为20℃～160℃和压应力为50MPa～137.5MPa的范围内,加稀土的ZA27-RE合金和未加稀土的ZA27合金的压蠕变量均随着温度和应力的升高而增大,ZA27-RE合金的压蠕变速率小于ZA27合金的压蠕变速率.加入稀土后,合金在压蠕变过程中的负蠕变量及出现负蠕变的温度和应力范围增大.两种合金的稳态蠕变速率均符合于半经验公式εs=Aσnexp(-Qa/RT).但在不同的温度,ZA27-RE合金的应力指数平均值n(4.66)和表观激活能平均值Qa(70.45KJmol-1)均大于ZA27合金的应力指数平均值n(3.87)和表观激活能平均值Qa(68.22KJmol-1),而合金的材料结构常数A为4.82×10-5,低于ZA27合金的材料结构常数A(0.002).两种合金的稳态蠕变速率均是由锌的点阵自扩散和位错的攀移所控制.
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