| TiC/AZ91D composites fabricated by in situ reactive infiltration process and its tensile deformation |
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| 作者姓名： | 王继杰 郭金花 陈礼清 |
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| 作者单位： | Department of Materials Engineering Shenyang Institute of Aeronautical Industrial Engineering Shenyang 110034 China，School of Materials and Metallurgy Northeastern University Shenyang 110004 China，Institute of Metal Research Chinese Acad emy of Sciences Shenyang 110016 China |
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| 摘 要： | 1 Introduction Relative to aluminum matrix composites, magnesium-matrix composites are receiving interests increasingly in recent years due to their low densities and high specific properties. They are potentially attractive for the applications in aeros…
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| 关 键 词： | TiC/AZ91D 复合材料 拉伸变形 应变]硬化 破裂机构 |
| 收稿时间： | 2005-07-11 |
| 修稿时间： | 2006-04-27 |
TiC/AZ91D composites fabricated by in situ reactive infiltration process and its tensile deformation |
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| WANG Ji-jie,GUO Jin-hua,CHEN Li-qing.TiC/AZ91D composites fabricated by in situ reactive infiltration process and its tensile deformation[J].Transactions of Nonferrous Metals Society of China,2006,16(4):892-896. |
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| Authors: | WANG Ji-jie GUO Jin-hua CHEN Li-qing |
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| Affiliation: | 1. Department of Mechanical Engineering, Anna University Regional Campus, Coimbatore 641046, Tamil Nadu, India;2. Department of Mechanical Engineering, Rajalakshmi Institute of Technology, Chennai 600124, Tamil Nadu, India;3. Department of Mechanical Engineering, SNS College of Engineering, Coimbatore 641107, Tamil Nadu, India |
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| Abstract: | An innovative processing route was adopted to fabricate 42.1%(volume fraction) TiC/AZ91D magnesium matrix composites. The reinforcement TiC was in situ synthesized from elemental powders of Ti and C and the matrix magnesium alloy AZ91D pressurelessly infiltrated into the preform of Ti and C. A comparative tensile deformation tests were conducted on the as-synthesized TiC/AZ91D composites and magnesium alloy AZ91D. The true strain—stress curves were fitted by Hollomon relation and their failure mechanisms were finally analyzed. The results show that the in situ formed TiC can increase the tensile strength, and is especially effective at elevated temperatures. Theoretical calculation of the strain hardening exponent (n) for TiC./AZ91D composites indicates that the n value ranges from 0.71 to 0.82 when tensile deformation was carried out at 423-723 K and shows fracture with brittle characteristic. However, the n value of 0.11-0.32 obtained for the matrix alloy AZ91D shows typical ductile features at elevated temperatures. |
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| Keywords: | magnesium-matrix composites TiC/AZ91D in situ reactive infiltration tensile deformation strain hardening fracture mechanism |
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