The temperature dependence of high-temperature strength and deformation mechanism in a single crystal CoNi-base superalloy

被引：24

作者：

Fan, Zhongding ^{[1
]}

Wang, Chenchong ^{[2
]}

Zhang, Chi ^{[1
]}

Yu, Yunhe ^{[1
]}

Chen, Hao ^{[1
]}

Yang, Zhigang ^{[1
]}

机构：

[1] Tsinghua Univ, Key Lab Adv Mat, Minist Educ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China

[2] Northeastern Univ, Sch Mat Sci & Engn, State Key Lab Rolling & Automat, Shenyang 110819, Liaoning, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 735卷

基金：

中国国家自然科学基金;

关键词：

Cobalt-base superalloy; Transmission electron microscopy; Compression test; Dislocation; Stacking fault; THERMODYNAMIC STABILITY; PLASTIC-DEFORMATION; ALLOYING ELEMENTS; PHASE-EQUILIBRIA; CREEP-PROPERTIES; PLANAR DEFECTS; TA; TI; ENERGY;

D O I：

10.1016/j.msea.2018.07.106

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The thermal stability and high-temperature strength of single crystal CoNi-base superalloys, Co-30Ni-10Al-7W (at%) and Co-30Ni-10Al-7W-2Ta-3Ti (at%), containing gamma'(L1(2)) phase have been investigated. The investigated CoNi-base superalloy with alloying additions of Ti and Ta exhibits excellent gamma' solves temperature, 1236 degrees C, and high-temperature strength, 622 MPa at 900 degrees C, compared to reported gamma'-strengthening Co-base superalloys. Detailed analyses of the deformation mechanisms for the investigated alloys were carried out by using the transmission electron microscopy (TEM) characterization. Two different transitions of deformation mechanisms for the gamma' phase, from superpartial dislocation shearing to dislocation bypassing and to stacking fault shear, occurred in the investigated alloys as the deformation temperature increased above the peak temperatures. Meanwhile, the high-temperature strength of the investigated alloys largely decreased as the transitions of deformation mechanism took place. The influence of alloying effects on energies of faults and the relationship between high-temperature strength and deformation mechanisms were discussed.

引用

页码：114 / 120

页数：7

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