TiC/AZ91D镁基复合材料高温压缩变形行为

金属学报

2005, Vol. 41

Issue (3): 326-332

论文

本期目录 | 过刊浏览

TiC/AZ91D镁基复合材料高温压缩变形行为

陈礼清;董群;郭金花;毕敬;徐永波

中国科学院金属研究所; 沈阳110016

Compressive deformation behavior of TiC/AZ91Dcomposites at elevated temperatures

CHEN Liqing; DONG Qun; GUO Jinhua; BI Jing; XU Yongbo

Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016

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 .
, , , , . Compressive deformation behavior of TiC/AZ91Dcomposites at elevated temperatures[J]. Acta Metall Sin, 2005, 41(3): 326-332 .

全文: PDF(431 KB)

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

Abstract：In situ reactive infiltration technique was utilized to synthesis TiC particulate-reinforced magnesium matrix composites (TiC/AZ91D). The hot compressive behavior of as fabricated composites was studied at strain rates $\dot{\varepsilon} =10 -3-10 -1 s-1 and at temperatures of 573-723 K. The strain rate sensitivity exponent ($m$), apparent activation energy (Q) and their relations with TiC content and temperature were calculated and analyzed according to the true stress-true strain curves. The results show that the compressive flow stress of the composites increases with increasing the TiC content. For the same TiC content, the flow stress decreases with elevating deformation temperatures or with decreasing the initial strain rates. The m value increases with increasing temperature and at the same deformation 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 its distribution, and the composites exhibit different deformation mechanisms at elevated temperatures.

Key words： magnesium matrix composite reactive infiltration in situ synthesis

收稿日期: 2004-04-21

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