PREPARATION AND SOLIDIFICATION CHARACTERISTIC OF IN SITU DIRECTIONALLY SOLIDIFIED EUTECTIC Al_(11)La_3 / Al COMPOSITE

Acta Metall Sin

1993, Vol. 29

Issue (3): 6-10 DOI:

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PREPARATION AND SOLIDIFICATION CHARACTERISTIC OF IN SITU DIRECTIONALLY SOLIDIFIED EUTECTIC Al_(11)La_3 / Al COMPOSITE

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DONG Hongbiao;JI Yongyi;ZHU Jun;LU Shuzu;ZHONG Xueyou;LI Jianguo University of Science and Technology Beijing Northwestern Polytechnical University; Xi'an lecturer;Department of Metallurgy;University of Science and Technology Beijing; Beijing 100083. PREPARATION AND SOLIDIFICATION CHARACTERISTIC OF IN SITU DIRECTIONALLY SOLIDIFIED EUTECTIC Al_(11)La_3 / Al COMPOSITE. Acta Metall Sin, 1993, 29(3): 6-10.

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Abstract In situ eutectic Al_(11)La_3 / Al composite material with regular orientation wasprepared by zone melt liquid metal cooling equipment of directional solidification under con-dition of high temperature gradient 700 K / cm and growth rate 6.0-20.0μm/s. Superposediffraction pattern of Al_(11)La_3/Al composite shows that preferred growth direction is(100)Al / (331) Al_(11)La_3, and habit plane is (002)Al/(116)Al_(11)La_3. A low density (103) twinis observed in Al_(11)La_3 and the growth of (103) twin induces to branching to change theinterlamellar spacing.

Key words: eutectic solidification directional solidification Al+(La Al)

Received: 18 March 1993

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