Effect of TiB2 particles on the microstructure and mechanical properties of Al-Si-Cu-Mg-Ni alloy fabricated by powder metallurgy

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-03-25 DOI:10.1016/j.matchar.2025.114979

Yanzhi Peng , Jian Wang , Zunyan Xu , Li Fu , Liyuan Liu , Qiong Lu , Jingmei Tao , Rui Bao , Jianhong Yi , Caiju Li

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引用次数: 0

Abstract

The mechanical properties of Al-11Si-3Cu-2Ni-1 Mg alloy (M142 alloy) are significantly affected by grain size, Si phase and intermetallic phase size and distribution. Therefore, the regulation of microstructure is very important to improve the mechanical properties of the alloy. In this work, high performance TiB₂/M142 composites were prepared by powder metallurgy and hot extrusion. The results show that TiB₂ particles can effectively refine the grain and the second phase, and induce more intragranular intermetallic phases. With the increase of TiB₂ content, the strength increased continuously, but the ductility increased first and then decreased. The improvement of the strength of the composites are mainly attributed to thermal mismatch strengthening. The first increase in ductility is mainly due to the capture and pin of the dislocation by intragranular intermetallic phases, which makes the grains have stronger dislocation accumulation and storage capacity. The subsequent reduction in ductility is mainly attributed to the local stress concentration in the TiB₂ agglomeration region, which eventually leads to the rapid failure of the composites.

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.