AgInCd合金压缩蠕变性能研究  

Compressive Creep Behavior of AgIn Cd Alloy

作　　者：陈乐[1] 肖红星[1] 梁波[1] 龙冲生[1] 

机构地区：[1]中国核动力研究设计院,四川成都610041

出　　处：《稀有金属材料与工程》2015年第11期2788-2792,共5页Rare Metal Materials and Engineering

基　　金：国家核电重大专项(2011ZX06004-016)

摘　　要：用RDL-50型拉伸蠕变试验机进行改装后的实验装置研究了铸态AgInCd合金在温度300~400℃及应力范围12~24 MPa内的压缩蠕变行为,分析了稳态速率与温度和应力的关系,计算了应力指数（n）和蠕变激活能（Q_a）,并结合蠕变后样品在透射电子显微镜下的微观形貌及位错组态,探讨了合金的压缩蠕变机制。结果表明：随温度和应力水平的升高,合金的稳态蠕变速率增加。相比较指数关系,蠕变速率与应力之间更符合幂函数关系。300、350和400℃条件下,合金的蠕变应力指数n分别为3.31、4.09和5.77;12、18和24 MPa条件下,合金的蠕变激活能Q_a分别为68.1、103.7和131.6 kJ/mol。微观形貌以层错为主,孪生为300℃的主要蠕变机制,位错攀移生成位错墙为400℃的主要蠕变机制。The compressive creep behavior of as-cast AgInCd alloy was investigated by special modified apparatus on RDL-50 creep tester at 300-400 ℃ and compressive stress was in the range of 12-24 MPa.The relationship between temperature,stress and steady strain rate has been analyzed.The stress exponent n and apparent activation energy Q_a of the creep process were calculated and based on the TEM images of microstructure the mechanisms of compressive creep behavior were discussed as well.The results show that the steady strain rate of the alloy increases with the increase of temperature and compressive stress.Compared with the exponential function,the relation between stress and rate seem to coincide with power function better.The stress exponent n are 3.31,4.09 and 5.77 at the temperatures of300 ℃,350 ℃ and 400 ℃,respectively.The apparent activation energy Q_a of the creep process are 68.1 kJ/mol,103.7 kJ/mol and 131.6kJ/mol under the compressive stress of 12 MPa,18 MPa and 24 MPa,respectively.There are lots of stacking faults in the TEM images under each creep condition,which play a critical role in the creep mechanisms.Mechanical twinning is the main mechanism at 300 ℃while dislocation climbing is the dominant mechanism at 400 ℃.

关 键 词：压缩蠕变 AG In Cd合金 稳态蠕变速率 位错 层错 

分 类 号：TL341[核科学技术—核技术及应用]