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OALib Journal期刊
ISSN: 2333-9721
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7n01铝合金挤压板的微结构、织构和性能*
Keywords: 金属材料,al-zn-mg合金,挤压工艺,时效工艺
Abstract:
？制备了挤压比λ为36和16的7n01铝合金挤压板材,并分别进行自然时效和人工时效处理。用光学显微镜、扫描电镜、透射电镜、常温拉伸、宏微观织构测试和慢应变拉伸实验对其进行表征,研究了挤压工艺对合金的力学性能和抗腐蚀性能的影响。结果表明,不同挤压比的板材在相同时效状态下的组织和性能有明显的差异。大挤压比板材的内部多为细小的再结晶晶粒,小挤压比板材内部为粗大的亚结构,因此具有比大挤压比板材更高的抗拉强度和屈服强度。透射电镜观察结果表明,大挤压比试样内晶界析出相比小挤压比时呈现更明显的断续分布。此外,挤压比相同的板材人工时效处理后其抗拉强度和延伸率比自然时效板材均有所下降,其中抗拉强度降低约为5.8%,但合金的屈服强度得到了显著提高(约为25%);在挤压比相同的情况下人工时效试样内晶界的析出相呈现断续分布,因此具有更好的抗腐蚀性能。
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