Microstructure, properties and application of YAl2 intermetallic compound as particle reinforcements

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:617

Article

Li, N.¹  Zhang, Q. Q.¹  Niu, L. Y.¹  Wu, G. Q.¹  Sha, W.² 

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

[2] Queens Univ Belfast, Sch Planning Architecture & Civil Engn, Belfast BT7 1NN, Antrim, North Ireland

关键词: Intermetallics;    Magnesium alloys;    Composites;    Mechanical alloying;    Electron microscopy;    Fracture;   

DOI  :  10.1016/j.msea.2014.08.047

来源: Elsevier

【 摘 要 】

An yttrium aluminum (YAl2) intermetallic compound ingot was prepared in an induction furnace under vacuum. The microstructure of YAl2 ingot was characterized by optical microscopy, scanning electron microscopy, and X-ray diffraction. The load bearing response of YAl2 intermetallic was investigated and compared with SiC ceramic by indentation combined with optical microscopy and scanning electron microscopy. Additionally, the tensile properties of the Mg-Li matrix composites reinforced with ultrafine YAl2 particles fabricated by planet ball milling were tested. The results show that the intermetallic compound ingot in this experiment is composed of a main face-centered-cubic structure YAl2 phase, a small amount of YAl phase, and minor Y and Al-rich phases. YAl2 intermetallic compound has excellent stability and shows better capability in crack resistance than SiC ceramic. The YAl2 intermetallic compound has better deformation compatibility with the Mg-14Li-3Al matrix than SiC reinforcement with the matrix, which leads to the superior resistance to crack for YAl2p/Mg-14Li-3Al composite compared to SiCp/Mg-14Li-3Al composite. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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