{"title":"Effects of Ti addition on microstructure and mechanical properties of 7075 alloy","authors":"X. Chen, H. Yan, X. Jie","doi":"10.1179/1743133614Y.0000000137","DOIUrl":null,"url":null,"abstract":"Abstract In the present research, aluminium metal matrix composites (AMMCs) with different weight percentages of TiAl3 particles were fabricated by in situ stir casting process. A heterogeneous nucleation phenomenon in the cast AMMCs was studied. Microstructural characterisation was investigated by optical microscopy, X-ray diffraction and scanning electron microscopy. Tensile test was carried out in order to identify the mechanical properties of composites after aging. The primary aluminium phase which nucleated heterogeneously on TiAl3 particles has been identified with a small lattice disregistry while their crystallographic orientation relationship was (001)TiAl3 // (100)Al. The microstructure analysis revealed uniform distribution of reinforcements, grain refinement and clean TiAl3/Al interface in specimens. The mechanical results showed that the addition of up to 1 wt-%Ti led to an improvement in the tensile strength and ductility as compared against matrix. Fractography of the specimens showed that the fracture surfaces of as cast composite exhibited mixed rupture characteristics of quasi-cleavage and tough.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"28 1","pages":"151 - 157"},"PeriodicalIF":1.1000,"publicationDate":"2015-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1179/1743133614Y.0000000137","citationCount":"21","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Cast Metals Research","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1179/1743133614Y.0000000137","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 21
Abstract
Abstract In the present research, aluminium metal matrix composites (AMMCs) with different weight percentages of TiAl3 particles were fabricated by in situ stir casting process. A heterogeneous nucleation phenomenon in the cast AMMCs was studied. Microstructural characterisation was investigated by optical microscopy, X-ray diffraction and scanning electron microscopy. Tensile test was carried out in order to identify the mechanical properties of composites after aging. The primary aluminium phase which nucleated heterogeneously on TiAl3 particles has been identified with a small lattice disregistry while their crystallographic orientation relationship was (001)TiAl3 // (100)Al. The microstructure analysis revealed uniform distribution of reinforcements, grain refinement and clean TiAl3/Al interface in specimens. The mechanical results showed that the addition of up to 1 wt-%Ti led to an improvement in the tensile strength and ductility as compared against matrix. Fractography of the specimens showed that the fracture surfaces of as cast composite exhibited mixed rupture characteristics of quasi-cleavage and tough.
期刊介绍：
The International Journal of Cast Metals Research is devoted to the dissemination of peer reviewed information on the science and engineering of cast metals, solidification and casting processes. Assured production of high integrity castings requires an integrated approach that optimises casting, mould and gating design; mould materials and binders; alloy composition and microstructure; metal melting, modification and handling; dimensional control; and finishing and post-treatment of the casting. The Journal reports advances in both the fundamental science and materials and production engineering contributing to the successful manufacture of fit for purpose castings.
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