Alloy material for thixocasting, process for preparing semi-molt

Details Alloy material for thixocasting, process for preparing semi-molt Alloy material for thixocasting, process for preparing semi-molt

1997-05-21

1998-12-15

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148437, 164900, B22D 2100

Patent

active

058491155

ABSTRACT:
A differential thermal analysis thermograph for a thixocasting aluminum alloy material is such that, a relationship, E.sub.1 >E.sub.2, is established between a peak value E.sub.1 of a first angled endothermic section generated by eutectic melting and a peak value E.sub.2 of a second angled endothermic section generated by melting of an element having a melting point higher than the eutectic point. Thus, a liquid phase produced by the eutectic melting has a large latent heat due to the fact that the peak value E.sub.1 of the first angled endothermic section is larger than the peak value E.sub.2 of the second angled endothermic section in a semi-molten eutectic aluminum alloy material derived from the thixocasting aluminum alloy material. As a result, in a solidification step of the thixocasting process, a liquid phase produced by the eutectic melting is sufficiently fed around a solid phase in response to the solidification and shrinkage of the solid phase, and then solidified. Thus, it is possible to produce a casting free from defects such as voids on the order of a micron.

REFERENCES:
patent: 1947121 (1934-02-01), Bonsack
patent: 4694882 (1987-09-01), Busk
patent: 5133811 (1992-07-01), Kirkwood et al.
patent: 5701942 (1997-12-01), Adachi et al.
Article entitled "Thixocasting--ein GieBverfahren zur Near-net-shape-Produktion," by H.P. Erz, Giesserei 77, 1990, Nr. 19-17, Sep., pp. 613-617--German (no translation).
Scripta Metallurgica, vol. 18, No. 1, 1984, pp. 301-304, XP000568503; Balmuth: "Particle Size Determination in An AL-3LI Allp:oy Using DSC".

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