电脉冲处理对FeMnSiCrNiNbC合金NbC析出及记忆效应的影响  

Influence of Electropulsing Treatment on the Shape Memory Effect and Precipitation of NbC in Fe-Mn-Si-Cr-Ni-Nb-C Alloy

作　　者：刘文博[1] 李宁[1] 杨世洲[1] 文玉华[1] 

机构地区：[1]四川大学,四川成都610065

出　　处：《稀有金属材料与工程》2009年第1期164-167,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50501015)

摘　　要：研究了电脉冲处理对FeMnSiCrNiNbC合金形状记忆效应的影响,并对其微观机理进行初步探讨。结果表明,Fe17Mn5Si8Cr5Ni0.5NbC合金经5%预变形,300V,1Hz电脉冲处理13次后形状回复率达到80%,比800℃时效1000s获得的最大值提高12%。SEM分析表明,电脉冲处理可在极短的时间内加速诱导大量、细小的NbC颗粒在基体内析出,进而有效地改善了合金的记忆性能并提高了效率。In order to further enhance shape memory effect （SME） and improve treatment process in Fe-based shape memory alloys, a pre-deformed Fe-Mn-Si-Cr-Ni-Nb-C alloy was subjected to a electropulsing treatment. The results show that the shape memory ratio reached the maximum 80% for the specimen subjected to a 5% pre-deformation and the electropulsing treatment at 300 V and 1 Hz for 13 times, which is 12% greater than that subjected to an ageing at 800℃ for 1000 s. In addition, it is found by SEM observation that the electropulsing treatment can induce a large amount of NbC precipitates with small sizes in the bulk at a short time, therefore, improve the shape memory property and increase the efficiency of shape memory effect efficiently.

关 键 词：电脉冲处理 加速诱导 NbC沉淀 形状记忆效应 

分 类 号：TG139.6[一般工业技术—材料科学与工程]