许发红,熊志芳,杨明,莫伟先,熊穗平,梁宇

• 1:贵州省特种设备检验检测院
• 2:贵州大学材料与冶金学院

摘要(Abstract)：

通过设计不同的表面超声滚压(USRP)参数,研究了塑性变形速率对7075-T6铝合金表面组织演化和力学性能的影响。结果表明:USRP处理可以在7075-T6铝合金表面获得不同层深的梯度纳米组织,且随着变形速率的增加表面变形层主要演化为层片状的纳米组织;当表面纳米化层趋于饱和后,最表层纳米结构片层的平均厚度约为61 nm,纳米层深度可达20μm以上;随着USRP深度的增加,纳米结构片层的宽度逐渐增大;透射电镜(TEM)分析表明表面纳米层和基体的析出相类型没有发生变化,层状纳米组织的析出相主要包含η相、η′相和GPⅡ区的混合析出物;USRP制备的梯度纳米组织提升了7075-T6铝合金的屈服强度和抗拉强度,其强化的机制与位错增殖和晶粒纳米化密切相关,且梯度纳米组织同时兼具优异的强度和塑性,层状纳米梯度组织展现出较好的应变强化能力。

关键词(KeyWords)： 7075铝合金;表面超声滚压;拉伸性能;微观组织演化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52464049);; 2024年度贵州省科技成果应用及产业化(联合资金):黔科合成果-LH[2024]重大021

作者(Author): 许发红,熊志芳,杨明,莫伟先,熊穗平,梁宇

DOI: 10.13289/j.issn.1009-6264.2025-0014

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