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CHANGE OF TEXTURE IN A SiC_w/LD2 COMPOSITE DURING SUPERPLASTIC DEFORMATION |
GU Wanli; WANG Dezun; YAO Zhongkai (Harbin Institute of Technology; Harbin 150001) |
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Cite this article:
GU Wanli; WANG Dezun; YAO Zhongkai (Harbin Institute of Technology; Harbin 150001). CHANGE OF TEXTURE IN A SiC_w/LD2 COMPOSITE DURING SUPERPLASTIC DEFORMATION. Acta Metall Sin, 1996, 32(6): 663-668.
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Abstract SiC_2 / LD_2 compoiste has been fabricated by using squeeze casting method and then hot extruded at 743 K and the estruded ratio is 1:22. The superplastic tensile tests were carried out in the temperature range from 773 K to 853 K and in the strain rate range from 8.33×10~(-4) s~(-1) to 8.33×10~(-3)s~(-1) A maximum elongation of 280% occured at a strain rate of 2×10~(-3) s~(-1) at 843 K. The texture of the composite has been studied in two directions by means of anti-pole figure. The results manifest that the texture of metal matrix diffuses during the superplastic deformation and the new recrystallized texture emerges at the beginning of deformation. The recrystallized texture diffuses with the progress of elongation and is similar to the original texture. This is related to the confused rotation of grains. The whiskers will rotate by the means of θrotation
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Received: 18 June 1996
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