XRD STUDY OF RECOVERY PROCESS OF COLD DEFORMED Ag AND Ag-Ce ALLOY

The recovery processes of cold deformed Ag and Ag-Ce alloy containing trace cerium were studied by XRD analysis.Based on Scherrer formula and an analytical program,the lattice distortion and subgrain size for both Ag and Ag-Ce alloy were determined in the recovery process.The cold deformed high purity Ag showed tow recrystallization temperature,obvious lattice relaxation and age-softening.The trace Ce solute is an effective inhibitor for recovery softening of high purity Ag since it raises the recrystallization temperature and restrains the lattice relaxation.

纯银和Ag-Ce合金在回复过程中的结构变化

观察与研究了冷变形高纯Ａｇ 和Ａｇ － Ｃｅ （２１ ×１０ － ６） 合金在回复过程中的一系列结构变化， 包括点缺陷减少与消失； 位错环与位错偶极湮灭， 位错密度降低； 形成稳定扩展位错和所谓“Ｙ”结， 层错能降低； 晶格畸变减少和亚晶粒长大等等。回复过程涉及点缺陷、线缺陷和面缺陷综合回复机制。借助于痕量Ｃｅ 的微合金化作用对于上述结构变化和回复软化具有明显抑制作用， 如拟制畸变晶格回复和亚晶长大， 降低Ａｇ 的层错能， 增大回复激活能等。详细讨论了回复过程中亚晶长大机制。