采用冷旋加工-退火工艺细化U-6.5Nb合金晶粒组织,研究旋压变形率、退火温度及退火时间对再结晶后晶粒组织的影响.结果表明,在研究范围内,旋压变形率对晶粒尺寸没有显著影响,随退火温度的升高和退火时间的延长,晶粒尺寸不断长大.在700,800和900℃保温过程中的晶粒长大指数分别为0.47,0.31和0.34,晶粒长大激活能为100.4kJ/mol.表明U-6.5Nb合金的晶粒长大受Nb原子的扩散控制.
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