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论文类型：期刊论文

发表时间：2019-01-15

发表刊物：JOURNAL OF ALLOYS AND COMPOUNDS

收录刊物：SCIE、Scopus

卷号：771

页面范围：1044-1051

ISSN号：0925-8388

关键字：Cryorolling; Precipitate; Electrical conductivity; Cu-Cr-Zr alloy

摘要：A two-step cryorolling and aging process was developed to fabricate high strength and high electrical conductivity CuCrZr alloys. The microstructural evolution, mechanical and electrical properties of Cu-1Cr-0.1Zr (wt.%) alloys subjected to the two-step cryorolling and aging process were investigated. The results showed that this two-step process reduced the width of the deformation bands from 113 nm to 80 nm. The introduction of precipitates in the matrix during intermediate aging was responsible for the narrowing of the deformation bands. Even though the cryorolled sample underwent detwinning, its ultimate tensile strength improved by similar to 35 MPa. Ordered face-centered cubic (fcc) Cr precipitates similar to 5 nm in size were observed in the Cu matrix, and these precipitates had a pinning effect on the motion of boundaries. A desired balance between the ultimate tensile strength (648 MPa) and electrical conductivity (79.80% IACS) was achieved by the coexistence of refined deformation bands, nanoscale deformation twins and nanoprecipitates. (C) 2018 Elsevier B.V. All rights reserved.