Deformation Induced Crystalline to Amorphous Phase Transitions in Intermetallics

这一建议强调研究 机械合金化过程中非晶结构的形成 结晶金属间合金 三镍基 将采用基于镍的金属间合金， 铝合金系统 A-15结构化合物， 锗-锗将被机械合金化， 超导特性导致的结构无序 测量. X射线衍射，透射电子 显微镜，差示扫描量热法将是 用于跟踪这些材料的结构变化。 临界缺陷密度的概念需要达到 非晶态结构状态将在实验中检查 程序

This proposal emphasizes research on the mechanisms of formation of amorphous structure during mechanical alloying of crystalline intermetallic alloys. Three nickel-base intermetallic alloys will be employed based on the nickel- aluminum alloy system. A-15 structure compounds niobium-tin and niobium-germanium will be mechanically alloyed, and their state of structural disorder followed through superconducting property measurements. X-ray diffraction, transmission electron microscopy, and differential scanning calorimetry will be employed to follow the structural changes in these materials. The concept of a critical defect density needed to reach the amorphous structural state will be examined in the experimental program