李廷举

个人信息Personal Information

教授

博士生导师

硕士生导师

任职 : 辽宁省高校重点实验室主任

性别:男

毕业院校:日本国名古屋大学

学位:博士

所在单位:材料科学与工程学院

学科:材料加工工程

联系方式:0411-84708940

电子邮箱:tjuli@dlut.edu.cn

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Semisolid processing AZ91 magnesium alloy by electromagnetic stirring after near-liquidus isothermal heat treatment

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论文类型:期刊论文

发表时间:2008-02-25

发表刊物:MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

收录刊物:SCIE、EI

卷号:475

期号:1-2

页面范围:194-201

ISSN号:0921-5093

关键字:AZ91 magnesium alloy; semisolid; microstructure; tensile properties

摘要:AZ91 magnesium alloy was semisolid processed under experimental conditions designed to yield from 3 to 40% of the primary particles, and the semisolid slurry was produced by electromagnetic stirring after feedstock had been isothermally heat treated at near-liquidus temperature. The thixotropic microstructures obtained were characterized in detail and linked to the corresponding tensile proper-ties. A unique microstructure was exhibited that the primary particles conglutinated together to form clusters due to sliding between solid particles and plastic deformation of solid particles during semisolid deformation [C.P. Chen, C.-Y.A. Tsao, Acta Mater. 45 (5) (1997) 1955-1968] which resulted from electromagnetic stirring. An increase of solid fraction exacerbated this agglomerating phenomenon accompanying an increment Of beta-Mg17Al12 content, and those finally resulted in a reduction in elongation. The fractographic analysis revealed that fracture mechanism and corresponding morphology of the rapture surface of tensile bars depend on the solid fraction of the primary particles. (c) 2007 Elsevier B.V. All rights reserved.