Al-8%Mg合金の引張性質に及ぼす水素の影響
1977 年 27 巻 10 号 p. 473-479
詳細
1977 年 27 巻 10 号 p. 473-479
Hydrogen charging and room temperature aging were carried out on the Al-8%Mg alloy aged at 170°C for 24hr. Tensile tests were made under a constant rate 0.05cm/min. The ultimate tensile strength and elongation are decreased with increasing the time of hydrogen charging, namely the hydrogen content, but the 0.2% proof stress is unchanged. The ductility is completely recovered during aging at room temperature. Penetration of hydrogen results in grain boundary embrittlement. The degree of embrittling is in proportion to the content of hydrogen. Diffusionable hydrogen occuping the octahedral site potentially causes embrittlement of the alloy. Undiffusionable hydrogen occuping the tetragonal site is free from such a role.
