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Acta Metall Sin  1996, Vol. 32 Issue (10): 1111-1115    DOI:
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MICROSTRUCTURE AND PROPERTIES OF A RAPIDLY SOLIDIFIED IN SITU Al-TiC COMPOSITE
G Xingcun;FANG Hongsheng;LIU Baicheng(Tsinghua University;Beijing 100084)(Department of Materials Science and Engineering;Tsinghua University;Beijing 100084)(Manuscript received 1995-11-16;in revised form 1996-04-01)
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G Xingcun;FANG Hongsheng;LIU Baicheng(Tsinghua University;Beijing 100084)(Department of Materials Science and Engineering;Tsinghua University;Beijing 100084)(Manuscript received 1995-11-16;in revised form 1996-04-01). MICROSTRUCTURE AND PROPERTIES OF A RAPIDLY SOLIDIFIED IN SITU Al-TiC COMPOSITE. Acta Metall Sin, 1996, 32(10): 1111-1115.

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Abstract  Combining the advantages of ingot metallurgy,rapid solidification technology and in situ processed composites,a kind of innovative in situ Al-TiC composite has been successfully made with a series of research on its microstructure and properties.The ingot metallurgy microstructures exhibited that the accumulated TiC particulate phase with a volume fraction of 14.5% and sizes of 0.2-1.0μm segregated generally at the α-Al grain boundaries.After rapid solidification and thermal extrussion,the microstructures comprise uniform fine-scale dispersions of TiC phase particles(the volume fraction slightly reduced as 13.5%) with sizes of 40-80 nm in a supersaturated α-Al matrix of 0.30-0.80 μm grain sizes.The rapidly solidified in situ Al-TiC composite exhibited high Young's modulus and substantial improvements in room and elevated temperature tensile properties.
Key words:  rapid solidification      Al-TiC      in situ processed composites.     
Received:  18 October 1996     
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1仝兴存.清华大学博士学位论文.19952仝兴存,沈宁福,柳百成.金属学报,1994;30:A1553 TongXC,ShenNF,LiuBC.JMaterSci,1995;30:36804BloyceA,SummersJC.In:ChadwickG,FroyenLeds.,MetalMatrixComposites,E-MRS,Amsterdam:North-Holland,1991:2315MitraR,FineME,WeertmanJR.JMaterRes,1994;8:2370
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