CALORIMETRIC EVIDENCE FOR POLYMORPHOUS CONSTRAINTS ON METASTABLE ZR-AL PHASE FORMATION BY MECHANICAL ALLOYING

被引：71
|
作者：
MA, E
ATZMON, M
机构：
来源：
PHYSICAL REVIEW LETTERS | 1991年 / 67卷 / 09期
关键词：
D O I：
10.1103/PhysRevLett.67.1126
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Metastable Zr(100-x)Al(x) alloys have been formed by ball milling of elemental Zr and Al powders: supersaturated hcp solid solution for x less-than-or-equal-to 15, and an amorphous phase for x greater-than-or-equal-to 17.5. Enthalpy-composition curves for both phases were determined by measurements of the enthalpy of transformation to equilibrium. A cusp indicating the crossover of these two curves is observed near the critical composition for amorphization. Our results indicate that phase formation by ball milling in Zr-Al is determined by polymorphous constraints and not by nucleation and growth under metastable two-phase equilibrium.
引用
收藏
页码：1126 / 1129
页数：4
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