论文部分内容阅读
通过半固态热处理研究了少量液相(f_l<15%)对α+Ti_2Cu型钛合金(Ti14)晶粒长大行为的影响。计算了不同温度及液相含量下晶粒的生长指数,研究了液相含量对该合金晶粒长大机制的影响。结果表明:晶粒尺寸与保温时间呈指数关系;温度升高促使液相含量增加。当液相含量在7%~15%时,晶粒长大机制从Ostwald熟化机制变为液相晶界熔断形式,晶粒合并长大。随着保温温度的升高和保温时间的延长,该合金的硬度降低。
The influence of a small amount of liquid phase (f_l <15%) on the grain growth behavior of α + Ti_2Cu titanium alloy (Ti14) was investigated by semi-solid heat treatment. The growth index of the grains under different temperature and liquid content was calculated, and the effect of liquid content on the grain growth mechanism of the alloy was also studied. The results show that the grain size and the holding time are exponential; the temperature increases to promote the liquid phase content increased. When the liquid content is between 7% and 15%, the grain growth mechanism changes from the Ostwald ripening mechanism to the liquid crystal grain boundary fusion, and the grains grow together. With the holding temperature and holding time extension, the hardness of the alloy decreases.