| 摘要 |
PROBLEM TO BE SOLVED: To obtain a door beam material made of aluminum alloy, excellent in breaking resistance and having required maximum load and energy absorption quantity. SOLUTION: In the case of an aluminum alloy of Al-Zn-Mg type, an extruded material having 0.05-0.17 work-hardening exponent (n-value) and (20 to 45) J/cm2 Charpy impact value is used. In the case of an aluminum alloy of Al-Si-Mg type, an extruded material having 0.07-0.20 n-value and (25 to 50) J/cm2 Charpy impact value is used.
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