Fabrication and properties of in situ heterogeneous Cu/TiB2 composites with a harmonic structure

被引：12
作者：
Jiang, Yihui [1 ]
Wang, Dingwen [1 ]
Xu, Yingqin [1 ]
Cao, Fei [1 ]
Liang, Shuhua [1 ]
机构：
[1] Xian Univ Technol, Shaanxi Prov Key Lab Elect Mat & Infiltrat Techno, Xian 710048, Shaanxi, Peoples R China
来源：
MATERIALS LETTERS | 2020年 / 263卷
基金：
中国国家自然科学基金;
关键词：
Powder technology; Composite materials; Harmonic structure; Strength; Ductility; SINTERING TEMPERATURE; DUCTILITY;
D O I：
10.1016/j.matlet.2019.127032
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In situ heterogeneous Cu/TiB2 composites with a harmonic structure, where the soft domains of pure Cu are completely surrounded by the hard TiB2 enrichment domains, were fabricated by hot pressing. By controlling the ratio of the Cu powders during ball milling and vibrational blending, composites with different degrees of heterogeneity were obtained. The results of tensile testing show that the composites with proper degrees of heterogeneity possess an excellent combination of strength and ductility. In light of the loading-unloading-reloading tensile test and microstructure analysis results, the strengthening and toughening mechanisms of the heterogeneous composites are discussed. The high strength is attributed to back-stress hardening resulting from plastic incompatibility. The back-stress hardening associated with the strain partitioning results in an enhanced ductility. (C) 2019 Elsevier B.V. All rights reserved.
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