Cr_(23)C_6和NbC颗粒析出模式对FeMnSiCrNiC合金组织及形状记忆效应的影响  

Influence of precipitation pattern of Cr_(23)C_6 and NbC on microstructure and shape memory effect of FeMnSiCrNiC alloys

作　　者：杨世洲[1,2] 李宁[1] 李辉[2] 

机构地区：[1]四川大学制造科学与工程学院,四川成都610065 [2]四川建筑职业技术学院博士后创新实践基地,四川德阳618000

出　　处：《材料热处理学报》2016年第3期89-94,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(50501015);德阳市重点科学技术研究项目(2014ZZ053)

摘　　要：采用SEM和XRD方法研究了Cr_(23)C_6和NbC颗粒析出模式对FeMnSiCrNiC合金组织及形状记忆效应的影响。结果表明:FeMnSiCrNiC合金经10%拉伸变形后在1073K温度时效能在较短时间内极大地提高合金的形状记忆效应。Cr_(23)C_6颗粒优先在γ/δ相界面、γ/ε相界面、γ晶界处形核,Cr_(23)C_6颗粒的形核受界面形核机制控制;NbC颗粒优先在γ相晶内的位错、层错等缺陷处形核,NbC颗粒的形核受位错或层错形核机制控制。NbC在热力学方面比Cr_(23)C_6更稳定。Effect of precipitation process of Cr23C6,Nb C particles on microstructure and shape memory effect of FeMnSiCrNiC alloys was investigated by means of SEM and XRD. The results show that shape memory effect can be remarkably improved in FeMnSiCrNiC alloys aged in shorter time at 1073 K after 10% tensile deformation. Cr23C6 particles preferentially nucleate on γ / δ phase interface,γ / ε phase interface,grain boundary of γ phase,so precipitation of Cr23C6 is controlled by the mechanism of nucleation on interface. Nb C particles selectively nucleate on crystal defects such as dislocation,stacking fault etc,so precipitation of Nb C is controlled by the mechanism of nucleation on dislocation or stacking fault. Nb C is more stable in thermodynamics than Cr23C6.

关 键 词：形状记忆合金 析出模式 Cr23C6 NBC 形状回复率 

分 类 号：TG139.6[一般工业技术—材料科学与工程]