(1. 四川大學(xué) 金屬材料系， 成都 610065;
2. 四川工業(yè)學(xué)院 材料科學(xué)與工程系， 成都 610039)
摘 要: 采用自制的實驗裝置研究了鑄態(tài)ZA27合金在常溫及高溫時的壓蠕變行為。在溫度為20～160℃和壓應(yīng)力為50～137.5MPa的范圍內(nèi)， 隨溫度和應(yīng)力的升高， 合金的壓蠕變量增大，穩(wěn)態(tài)蠕變速率的對數(shù)分別與應(yīng)力和溫度的對數(shù)曲線有較好的線性關(guān)系， 穩(wěn)態(tài)蠕變速率符合半經(jīng)驗公式。 在不同的溫度下， 應(yīng)力指數(shù)n相近， 平均值為3.87； 不同的應(yīng)力下， 表觀激活能Qa相差不大， 平均值為83.73kJ/mol， 材料結(jié)構(gòu)常數(shù)A為0.002， 穩(wěn)態(tài)蠕變速率由鋅的點陣擴(kuò)散和位錯的攀移所控制。
關(guān)鍵字: ZA27合金; 壓蠕變; 應(yīng)力指數(shù); 激活能
as-cast ZA27 alloy
（1. Department of Metal Materials, Sichuan University,
Chengdu 610065, China;
2. Department of Materials Science and Engineering,
Sichuan Institute of Technology,Chengdu 610039, China）
Abstract:The compressive creep behavior of an as-cast ZA27 alloy was investigated at room and high temperatures in the range of 20～160℃ and different compressive stress in the range of 50～137.5MPa with special apparatus. The results show that the creep increases with increasing 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 at different temperatures are similar, i.e. 3.97(20℃), 3.87(60℃), 3.82(100℃) and 3.81(160℃). And the appearance activation energies under different stresses are not greatly different, i.e. 84.58, 84.28, 83.15 and 83.89kJ/mol. The average values, stress exponent and activation energy, are 3.87 and 83.73kJ/mol respectively. Materials constant A is 0.002. The steady creep rate of the experimental alloy is controlled by lattice diffusion in zinc or by a dislocation limb.
Key words: ZA27 alloy; compressive creep; stress exponent; activation energy
