期刊
FUSION ENGINEERING AND DESIGN
卷 117, 期 -, 页码 20-23出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.fusengdes.2017.02.032
关键词
W-Cu graded interface; Cohesion strength; Atomic structure; First-principle calculation
资金
- Key Project of ITER of Ministry of Science and Technology of China [2014GB115000]
- National Natural Science Foundation of China [51534009]
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China
W-Cu graded interface is a solution to big differences of properties between W and Cu, while the number and composition of graded layers in the literature are quite different. The present first principles calculation reveals that W-rich graded interfaces possess higher strength and lower interface energy than Cu-rich counterparts. It shows that the differences of thermal expansion and Young's modulus between overlayer and substrate are decisive factors in the design of Cu-rich and W-rich graded interfaces, respectively. A graded structure of W8Cu1/W7Cu2/W6CU3/CU6W3/Cu8W1 is therefore suggested theoretically. (C) 2017 Elsevier B.V. All rights reserved.
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