(沈阳工业大学 材料科学与工程学院，沈阳 110178)
摘 要: 采用高机械压力方法制备ZA27合金试样，通过X射线和金相分析手段研究晶体结构与组织变化。结果表明：随着压力的增加，晶面间距和晶格常数都逐渐减小，当压力达到5 GPa时，富铝α相在(200)与(220)晶面 处，晶面间距较常压力时的分别减小1.07%和1.15%；在常压至3 GPa范围内，晶粒由粗大的树枝晶→细小的树枝晶→粒状、椭球状枝晶转变的趋势，通过压力对合金凝固溶质扩散系数的影响结合Scherrer公式计算分析其组织变化原因，得出在一定的压力范围内，随着压力的增大，晶粒尺寸逐渐变小，这一结论与实验结果相符。
关键字: 超高压；ZA27合金；晶体结构；晶粒组织
（School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110178, China）
Abstract:ZA27 alloy was produced under super high pressure. The remarkable changes of crystal structure and microstructure were analyzed by XRD and metallography microscopy. The results show that the interplanar crystal spacing and lattice index of Al-rich α phase reduce gradually with increasing pressure. When the pressure reaches from common pressure to 5 GPa , Al-rich α phase lies on the (200) and (220) crystal faces, the interplanar crystal spacing are reduced by 1.07% and 1.15%. From common pressure to 3 GPa , the microstructure of ZA27 alloy changes from thick dendrites to fine dendrites, and finally to granular. According to the effect of solute diffusion coefficient under super high pressure and the calculation of Scherrer formula, it can be seen that the crystal organization is fine within the bounds of certain pressure. This conclusion is consistent with the experiment results.
Key words: super-high pressure; ZA27 alloy; crystal structure; grain organization
