Ductility Loss of Al-Mg Alloys at High Temperatures

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  • Al-Mg合金の高温における延性低下
  • Al Mg ゴウキン ノ コウオン ニ オケル エンセイ テイカ

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Abstract

The dependence of the hot ductility of Al-Mg solid solution on temperature, strain rate, grain size and solute content has been examined in detail by use of tensile test. At a constant strain rate, a ductility (reduction of area) versus temperature curve showed a remarkable trough. With increase in the strain rate, the ductility trough appeared at higher temperatures, while its depth remained almost constant. The temperature at which ductility becomes minimum (Tmin) can be correlated with the strain rate (\dotε) by \dotε∝exp(−Qφ⁄RTmin), where Qφ (137 kJ/mol) agrees well with the activation energy for volume diffusion. The ductility is determined uniquely by a parameter Z=\dotεexp(Qφ⁄RT), where R is the gas constant and T the absolute temperature. The effect of the grain size on the minimum ductility (φmin) at a constant strain rate, can be empirically expressed as φmin=1⁄(1+d⁄D0), where D0 is a materials constant and increases with increasing solute content. The ductility loss was associated with the intergranular fracture, and a number of small dimples were observed on the fracture surface, suggesting the growth and interlinkage of cavities. The results are compared with those for other metallic materials.

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