Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第10卷    第2期    总第35期    2000年4月

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文章编号:1004-0609(2000)02-0149-06
MB2/SiC复合材料的高应变速率超塑性
陈培生,孙扬善,隽海昌,蒋建清,马爱斌

(东南大学 材料科学与工程系,南京210096)

摘 要: 用搅拌法制备了以MB2为基、以SiC颗粒为增强体的镁基复合材料,铸锭在390 ℃热挤压成棒材。 在温度为380~560 ℃和应变速率为2.08×10-3s-1~5.21×10-1s-1的范围内,测试了挤压态MB2/10%SiC(体积分数)和MB2/5%SiC镁基复合材料的超塑性。M B2/10%SiC在温度为525℃、应变速率为2.08×10-1s-1时最大延伸率可达228%,应变速率敏感性指数为0.39。超塑性拉伸断口上存在丝棒状物质。

 

关键字: 镁/碳化硅复合材料;高应变速率;超塑性

High strain rate superplasticity in MB2/SiC magnesium matrix composites
CHEN Pei-sheng, SUN Yang-shan, JUAN Hai-chang, JIANG Jian-qing, MA Ai-bin

Department of Materials Science and Engineering, Southeast University, Nanjing 210096, P.R.China

Abstract:Ingots of MB2 (magnesium-based alloy) matrix composites reinforced with SiC particulates (2 μm), of 10 % or 5%(in volume fraction) were prepared by stir casting and then extruded with a reduction ratio of 49∶1 at 390℃. Superplasticity of the composites was investigated at 380 ℃~560 ℃ and with strain rate from 2.08×10-3s-1 to 5.21×10-1s-1. The maximum of total elongation as high as 228% was obtained in MB2/10%SiC composite at 525℃ with a strain rate of 2.08×10-1s-1, and the strain rate sensitivity exponent (m) was 0.39. Filament was observed on the fracture surface of the specimens showing superplasticity.

 

Key words: Mg/SiC composite; high strain rate; superplasticity

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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