Antiphase Boundary Strengthening in a Single Crystal Nickel-base Superalloy

材料科学技术（英）, 2002, 18(2): 159-162.

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1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China

2.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China

3.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China

4.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China

5.Department of Mechanical Engineering, Wayne State University, Detroit MI 48202, USA

基金项目: This work is supported by the National Natural Science Foun-dation of China(50071065,59871052) 国家重点基础研究发展计划(973计划)(G19990650)

Antiphase Boundary Strengthening in a Single Crystal Nickel-base Superalloy

Keywords： Single crystal nickel-base superalloy

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 increases with a dominate role in strengthening of the single crystal Ni-base superalloy DD8.There are three kinds of mechanisms for forming the APBs which were observed in the present materials. One is matrix dislocation network. The contribution of the antiphase boundary energy to the strength of the alloy can be expressed by:Burgers vector; a is the lattice constant; G is the shear modulus, and k is the proportional constant.

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Antiphase Boundary Strengthening in a Single Crystal Nickel-base Superalloy

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