Tetsuyuki Ikeda1 and Seiki Nishi2
1Graduate School, Nagoya University, Nagoya
By rapid quenching of Al-1 ∼ 5%Mn alloys from the liquid state, an equilibrium structure, a structure formed by movement of the eutectic point, an incompletely super-saturated solid solution and a completely solid solution were obtained successively with increase in solidification rate. Micro-Vickers hardness measurement, tensile test and thermal analysis were used to examine the relations between the mechanical properties and these structures. The result obtained were as follows:
(1) With increase in solidification rate (V) (or change of solidified structures), Micro-Vickers hardness (Hv), ultimate tensile strength ( σ B) and elongation ( δ ) rose according to the relation of Y=AV+B or Y=C (Y: σ B, Hv, δ , V: solidification rate, A, B, C: constant).
(2) The ranges of solidification rate at which each structure was formed, were shown by a diagram for Al-1 ∼ 5%Mn alloys.
(3) The constitution diagrams to show the relations of average solidification rate---thickness distance and Mn content---thickness distance were obtained.
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