301 超微細粒金属材料の超塑性変形(関東支部茨城講演会)

概要

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It is generally known superplastic materials that flow stress decreases and elongation to failure increases as the grain size is decreased. However, in some materials, it has been reported that flow stress increases and elongation decreases when the grain size is markedly reduced to nanometer range. In this study, the deformation mechanism of the ultra-fine-grained metallic material with a grain size within the nanometer range has been basically investigated from the results of tensile test and microstructural observation on a Zn-Al eutectoid alloy. By controlling the aging condition after solution treatment and subsequent quenching, two specimens with ultra-fine-grains of about 300nm in diameter and with normal-sized grains of 2.3μm were prepared. Tensile test revealed that the elongation to failure was smaller in the ultra-fine-grained specimen than in the normal-grained specimen, the reference material.
一般社団法人日本機械学会の論文
2005-09-08