超声冲击纳米化对7B04高强铝合金疲劳性能的影响  

Effect on Fatigued Life of 7B04 Aluminum Alloy by Ultra-sonic Nanometer Treatment

作　　者：朱其芳[1] 孙泽明[1] 朱宝宏[1] 熊柏青[1] Vacily A．Klimenov Viacheslav Borozna 

机构地区：[1]北京有色金属研究总院,北京100088 [2]Tomsk Polytechnic University, Tomsk 634050, Russia

出　　处：《纳米科技》2009年第6期25-28,共4页

摘　　要：探讨了超声波冲击表面纳米化作用后对7B04高强铝合金疲劳性能的影响,研究得到,应用超声波冲击表面纳米化技术,使7B04高强铝合金表面得到晶粒度10-50nm的纳米层,层厚约为20-50μm,并形成了由表面向里层的晶粒尺度从小到大的梯度结构,而且晶粒取向与冲击行走方向具有趋向一致性,超声波冲击作用于试样表面后形成了约为200Mpa的残余压应力层,使原来潜在的、或已存在的微小表面裂纹被压合,可提高7B04高强铝合金材料的疲劳寿命5-10倍。The task probed into that the effect on the fatigue performance of the 7B04 aluminum alloy after Ultra-sonic treatment. The research showed that by Ultra-sonic treatment technique, nanometer grains on the surface of the alloy were obtained. The grain size was 10 nm to 50 nm. The thickness of the layer of nanometer grains was about 20-50 μm. Moreover the gradient structure is formed through the surface to the liner. The grains size were from smaller to bigger, and the orientation of crystalline grain correspondence matched with the orientation of Ultra-sonic treatment. After-Ultrasonic treatment, the remains pressure stress layer was formed which act as 263MPa. The former and small surface cracks was getting near to shut. And improved the fatigue life of 7B04 aluminum alloy for 5 to 10 times.

关 键 词：高强高韧铝合金 超声波冲击 表面纳米化 疲劳寿命 

分 类 号：TB383[一般工业技术—材料科学与工程] TG146.21[金属学及工艺—金属材料]