定向凝固Ni-20Al-30Fe合金变形的TEM原位观察  

TEM IN SITU OBSERVATION OF TENSILE DEFORMATION OF DIRECTIONALLY SOLIDIFIED Ni-20AI-30Fe ALLOY

作　　者：张万明[1] 郑启[1] 孙晓峰[1] 于洋[1] 胡壮麒[1] 

机构地区：[1]中国科学院金属研究所,沈阳110015

出　　处：《金属学报》1999年第4期375-378,共4页Acta Metallurgica Sinica

摘　　要：通过对定向凝固Ｎｉ－２０Ａｌ－３０Ｆｅ合金进行的ＴＥＭ原位拉伸观察得出，塑性１相向脆性β相的变形传递是促进ＢＺ结构ｑ相进行塑性变形的内在机制．首次在该合金中观察到变形传递形成的相界弯折，β相内的位错来自于这些相界弯折两相间的变形传递并不限定在Ｋ－Ｓ关系中的平行晶面进行位错同相界的作用过程中。The tensile deformational behavior of directionally solidified Ni-20Al-30Fe alloy has beenin situ investigated by TEM. The results show that the deformation transfer from ductile γ phase tobrittle β phase is the inherent mechanisms of promoting ductile deformation of β phase with B2 structure.The curve ledge in phase boundary (PB) introduced by deformation transfer was firstly observed in thisalloy. The dislocations in P phase may be produced by the curve ledge. It can be concluded that thestrain transfer does not take place only on K-S relationship planes. During the process of interaction ofdislocatinns with PB, the phenomenon of dislocation absorption and emission by PB was found.

关 键 词：定向凝固 TEM 拉伸变形 原位观察 高温合金 

分 类 号：TG132.32[一般工业技术—材料科学与工程]