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- W610401838 abstract "The relationship between the structure and hot workability of Al-Mg-Si alloy ingots has been investigated. The ingots were cast at various cooling rates and their metallographic structures were examined. Hot workability of the ingots were evaluated by means of the hot torsion test at 450°C and at strain rate 10 sec−1. It is shown that the maximum shear stress of the ingots, τmax, is given by the relation,(This article is not displayable. Please see full text pdf.) where d is the mean dendrite arm spacing, D is the mean grain diameter and τ0, k and K are constants. This means that the rapidly solidified ingots, with smaller values of d and D, show higher deformation resistance under hot working conditions. Grain refining also results in higher τmax. However, when the cooling rate is too slow during solidification, coarse second phase particles and shrinkage cavities are formed in the interdendritic region and poor high temperature ductility is observed. When those ingots are solution and precipitation-treated, τmax values decreased irrespective of the solidification condition. The practical implication of the obtained results is that the most desirable ingots for hot working can be obtained by rapid cooling during solidification and subsequently by heat treatment under a condition to minimize their high temperature deformation resistance.The measured values of τmax and fracture shear strain are also presented for the properly heat treated direct-chill cast ingots when torsion tested in the temperature range 300°∼500°C and at strain rate 1∼100 sec−1." @default.
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- W610401838 date "1971-01-01" @default.
- W610401838 modified "2023-10-18" @default.
- W610401838 title "Effects of Casting Structure on the Hot Workability of Al-Mg-Si Alloy Ingots" @default.
- W610401838 doi "https://doi.org/10.2320/jinstmet1952.35.2_156" @default.
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