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发明公开
CN109266923A 一种高强度、高疲劳寿命Al-Cu-Mg-Si-Mn系铝合金及其加工方法 无效 - 撤回

一种高强度、高疲劳寿命Al-Cu-Mg-Si-Mn系铝合金及其加工方法
摘要：
本发明公开了一种高强度、高疲劳寿命Al-Cu-Mg-Si-Mn系铝合金及其加工方法，铝合金的组分及重量百分比为：Cu 3.7~4.6%，Mg 0.2~0.8%，Si 0.5~1.0%，Mn 0.4~1.0%，Fe≤0.3%，Zn≤0.25%，Cr≤0.2%，Ti≤0.15%，其它元素≤0.15%，其余为Al。铝合金的加工方法：对铝合金进行配料、熔炼、铸造，得到铸锭；对铸锭进行均匀化热处理、挤压、预拉伸、固溶处理和人工时效处理。本发明通过合金成分设计和热处理工艺的综合应用，定量控制了弥散相数密度、粗大相面积百分数和再结晶面积百分数三个重要的组织特征，使合金具有高强度和高疲劳寿命。
摘要（英）：

The invention discloses an Al-Cu-Mg-Si-Mn-based aluminum alloy with high strength and a long fatigue life and a processing method thereof. The aluminum alloy comprises, by weight, 3.7-4.6% of Cu, 0.2-0.8% of Mg, 0.5-1.0% of Si, 0.4-1.0% of Mn, 0.3% of Fe or below, 0.25% of Zn or below, 0.2% of Cr or below, 0.15% of Ti or below, 0.15% of other elements or below and the balance Al. The processing method of the aluminum alloy includes the steps that the aluminum alloy is subjected to material preparation, smelting and casting to obtain a cast ingot; the cast ingot is subjected to homogenization heat treatment, extrusion, pre-stretching, solution treatment and artificial aging treatment. Through design of alloy compositions and comprehensive application of a heat treatment process, three important structural characteristics including the dispersion phase number density, the coarse phase area percentage and the recrystallization area percentage are quantitatively controlled, so that the alloy has high strength and a long fatigue life.

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