SUBSTRUCTIONAL FEATURE OF SURFACE LASER MELTED ZAlSi 12 ALLOY

Acta Metall Sin

1994, Vol. 30

Issue (22): 471-475 DOI:

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SUBSTRUCTIONAL FEATURE OF SURFACE LASER MELTED ZAlSi 12 ALLOY

LIANG Gongying; LI Chenglao; ZHOU Jiajin(Xi'an Jiaotong University)

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LIANG Gongying; LI Chenglao; ZHOU Jiajin(Xi'an Jiaotong University). SUBSTRUCTIONAL FEATURE OF SURFACE LASER MELTED ZAlSi 12 ALLOY. Acta Metall Sin, 1994, 30(22): 471-475.

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Abstract Mopohological alteration of Si in eutectic of the surface laser-melted ZAlSi 12 alloy was observed from lath-like into corallite under SEM and TEM. The laser-melted treatment on the ZAlSi 12 alloy surface makes its substruction not only an essential change over dislocation density and mopohology of the laser-melted region, but also an increase of dislocation density in the Al matrix around the heat effecting zone and morphological alteration of dislocation from linear shape into network.Meamwhile, numerous crystallites recrystallize out in the heat effecting zone.In the laser-melted region,α-Al is supersaturated and solutionized with Si atoms. The Si atoms segregated to form the enriched area, and a great many very fine Si crystals precipitated out along <110> direction. X-ray diffraction analysis showed that the lattiee parameters of Al may be decreased by the laser-melted treatment.

Key words: aluminium alloy laser scanning dislocation

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1994/V30/I22/471

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