알루미늄 합금재

알루미늄 합금재는 7.0∼10.0%(질량%, 이하 동일)의 Mg, 0.1% 이하의 Ca를 함유하고, 잔부가 알루미늄 및 불가피한 불순물로 이루어지고, 인장 강도가 300 MPa 이상 500 MPa 미만, 파단 신율이 20% 이상이다. An aluminum alloy material contains Mg: 7.0% to 10.0% (% by mass, the same applies hereinafter) and Ca: not more than 0.1%, and the aluminum alloy material contains a remainder constituted by aluminum and an inevitable impurity. The aluminum alloy material has a tensile strength of not less than 300 MPa and less than 500 MPa and an elongation of not less than 20%. (Figure)