Ａｌ‐Ｍｇ‐Ｓｉ合金の引張特性および成形性に及ぼす凝固速度の影響
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Effect of cooling rate during casting, which is controlled by changing DC ingot thickness, on the tensile properties and formability of Al–0.6%Mg–(0.6–1.6) %Si alloys were investigated. The formability is evaluated by using deep drawing and bending tests. In case of high cooling rate corresponding to that of the roll-casting, the tensile and yield strength, local and total elongation and deep drawability are increased. The increase of tensile properties is due to a marked reduction in the size and amounts of second-phase constituent particles and an increase in the solute element concentration in the matrix. The improvement of deep drawability is related to an increase in the tensile strength. On the other hand, the bendability of the alloys cast in a high cooling rate is inferior, especially in the direction transverse to the rolling direction. These alloy ingots were not homogenized and not hot-rolled to simulate the fabrication process of a roll-cast strips. The fine second-phase particles existing continuously on cell-boundaries act as propagation routes of cracks during bending and result in poor bendability.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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