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TiC/AZ91D镁基复合材料高温压缩变形行为
引用本文:陈礼清,董群,郭金花,毕敬,徐永波. TiC/AZ91D镁基复合材料高温压缩变形行为[J]. 金属学报, 2005, 41(3): 326-332
作者姓名:陈礼清  董群  郭金花  毕敬  徐永波
作者单位:中国科学院金属研究所,沈阳,110016;东北大学材料与冶金学院,沈阳,110004;中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳,110016
基金项目:教育部留学回国人员科研启动基金辽宁省自然科学基金20032012中国科学院金属研究所新入所骨干人员科研启动基金资助项目
摘    要:利用自发渗透原位合成法制备了不同体积分数的TiC增强AZ91D镁基复合材料,研究了不同压缩应变速率以及不同变形温度下复合材料的热变形行为,计算分析了不同温度下应变速率敏感指数(m)和表观激活能(Q)与TiC含量的关系.结果表明:TiC/AZ91D复合材料压缩流变应力随TiC含量的增加而升高;TiC含量相同时,流变应力随温度升高或初始应变速率减小而降低.m值随变形温度升高而增大;变形温度以及压缩应变速率相同时,m值随TiC含量升高而增大.Q值依赖于温度、应变速率和TiC含量及其分布,不同条件下其高温变形机制有所差异.

关 键 词:镁基复合材料  反应渗透法  原位合成  高温压缩变形
文章编号:0412-1961(2005)03-0326-07
收稿时间:2004-04-21
修稿时间:2004-07-06

Compressive deformation behavior of TiC/AZ91Dcomposites at elevated temperatures
CHEN Liqing,DONG Qun,Guo Jinhua,BI Jing,XU Yongbo. Compressive deformation behavior of TiC/AZ91Dcomposites at elevated temperatures[J]. Acta Metallurgica Sinica, 2005, 41(3): 326-332
Authors:CHEN Liqing  DONG Qun  Guo Jinhua  BI Jing  XU Yongbo
Affiliation:Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016
Abstract:In situ reactive infiltration technique was utilizedto synthesis TiCparticulate-reinforced magnesium matrix composites(TiC/AZ91D). The hot compressivebehavior of as fabricated composites wasstudied at strain rates$dot{varepsilon} =10 -3-10 -1 s-1and at temperatures of 573-723 K. The strainrate sensitivity exponent ($m$), apparent activationenergy (Q) and their relations with TiC content andtemperature were calculated and analyzedaccording to the true stress-true strain curves.The results show that the compressive flow stressof the composites increases with increasingthe TiC content. For the same TiCcontent, the flow stress decreases withelevating deformation temperatures or with decreasingthe initial strain rates. The m value increases withincreasing temperature and at the samedeformation temperature and strain rate,the m value increases with increasing the TiC content.The Q value depends on the deformation temperature,strain rate and TiC content and itsdistribution, and the composites exhibitdifferent deformation mechanisms at elevatedtemperatures.
Keywords:magnesium matrix composite   reactive infiltration   in situ synthesis   compressive deformation
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