宋娜,孙奥,于惠玲,张德军,胡晓青,付薛洁,曹善鹏

• 1:烟台南山学院智能科学与工程学院
• 2:山东南山铝业股份有限公司

摘要(Abstract)：

自然时效硬化现象和烘烤硬化响应能力是影响7075铝合金加工性能和使用性能的关键。研究了固溶处理后7075铝合金的自然时效硬化现象及其对烘烤硬化能力的影响，分析了不同预时效处理对合金自然时效硬化的影响，提出了一种双级预时效处理工艺。采用X射线衍射仪、透射电镜、维氏硬度计和万能拉伸试验机等研究了合金经不同热处理后的组织和性能。结果表明:固溶处理后，7075铝合金在室温停滞过程中存在明显的自然时效硬化现象，显著降低其烘烤硬化能力;自然时效13天后，烘烤硬化增量由55 HV0.5降低到7 HV0.5;预时效处理，可以有效抑制自然时效硬化效应;120℃×10 min+160℃×10 min双级预时效处理，促进了合金中的η'过渡相的形核和长大，与基体呈■//[110]_(Al)取向的半共格关系;双级预时效处理后，烘烤硬化处理后合金的屈服强度增量达到171 MPa，相比于120℃×20 min预时效处理的138 MPa，硬化增量提高了23.91%，同时发生塑性失稳的应变量更大。

关键词(KeyWords)： 7075铝合金;自然时效;双级预时效;组织演变;烘烤硬化

Abstract:

Keywords:

基金项目(Foundation): 烟台南山学院科研发展基金(2025KJ02012);烟台南山学院青年科研基金(NS2022Q13)

作者(Author): 宋娜,孙奥,于惠玲,张德军,胡晓青,付薛洁,曹善鹏

DOI: 10.13289/j.issn.1009-6264.2025-0112

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