Antiphase boundary strengthening in a single crystal nickel-base superalloy

被引：0

作者：

Zhang, Jinghua ^{[1
]}

Jin, Tao ^{[1
]}

Xu, Yongbo ^{[1
]}

Hu, Zhuangqi ^{[1
]}

Wu, Xin ^{[1
]}

机构：

[1] Natl. Lab. for Mat. Sci., Inst. of Metal Res., Chinese Acad. of Sci., Shenyang 110016, China

来源：

Journal of Materials Science and Technology | 2002年 / 18卷 / 02期

关键词：

Nickel alloys - Nickel metallurgy - Single crystals - Strengthening (metal) - Transmission electron microscopy;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

An investigation has been made into strengthening mechanism in a single crystal nickel-base superalloy DD8 by transmission electron microscopy. The results show that the stress rupture strength of the alloy increase with the decrease of misfits, and the antiphase boundaries (APBs) formed in the ordered γ' phase, rather than the misfits, play a dominate role in strengthening the single crystal Ni-base superalloy DD8. There are three kinds of mechanisms for forming the APBs which are observed in the present materials. One is mis-arrangement of the local ordered atoms in the γ' phase due to the local strain; the second arises from the 1/2(110) dislocations cutting into the γ' phase, and the third is the formation of the APBs induced by the 1/2(110) matrix dislocation network. The formula for the contribution of the antiphase boundary energy to the strength of the alloy is presented.

引用

页码：159 / 162