Al-Mg-Si系合金板の伸びと曲げ加工性に及ぼすけい素量の影響 [in Japanese] Effect of Si content on the elongation and bendability of Al-Mg-Si alloy sheets [in Japanese]
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The effects of the Si content on the elongation and bendability of Al–Mg–Si alloy sheets were investigated. The elongation increased with the Si content to 1.1%. The Work hardening exponent (<i>n</i> value) of the Al–Mg–Si alloys was calculated on the basis of true stress–true strain curves. The <i>n</i> value of the Al–Mg–Si alloy increased to a maximum value and then decreased with strain. The decreasing rate of the <i>n</i> value after the maximum <i>n</i> value of the low Si alloy was higher than that of the high Si ones. It is postulated that the decreasing rate caused the difference in the elongation. In the case of the low Si alloy, the <i>n</i> value decreased with strain at the true strain of 0.08 and micro-bands were observed in the TEM structures. It is considered that the micro-bands of the low Si alloy were more easily formed than those of the high Si ones. The bendability was inferior as the Si content increased. The high Si alloy contained large second phase particles which caused micro-voids during the bending operation. The micro-voids would be initiation sites of cracks and caused inferior bendability. It has been reported that the bendability is influenced by the second phase particles and formation of the share band. In this investigation, the second phase particle was the main reason for the inferior bendability rather than the formation of the share band.
- J. Japan Inst. Light Metals
J. Japan Inst. Light Metals 58(7), 285-289, 2008-07-30
The Japan Institute of Light Metals