表面机械研磨处理对Cu-4Ti合金组织及力学性能的影响  

Microstructure and mechanical properties of nano-crystalline surface layer in Cu-4Ti alloy induced by surface mechanical attrition treatment

作　　者：牛娜[1] 卫英慧[1] 林万明[1] 侯利锋[1] 杜华云[1] 

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《金属热处理》2012年第8期46-49,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(51044007;51001079);教育部博士点基金(20091402110004);山西省自然科学基金(201101102-1;2)

摘　　要：对Cu-4Ti合金分别进行45 min和60 min的表面机械研磨处理(SMAT),采用X射线衍射仪,光学显微镜,扫描电镜,显微硬度计等对处理不同时间的样品组织及力学性能进行了分析。结果表明,Cu-4Ti合金经表面机械研磨处理45 min和60 min后,表层晶粒尺寸分别达到了40.72 nm和17.12 nm,并且都出现了分界层,这与前人研究结果出现的过渡层截然不同。表面机械研磨方法可以强化金属表面,Cu-4Ti合金经SMAT 45 min和60 min后,表面硬度比基体分别提高了51%和56%。By means of surface mechanical attrition treatment （SMAT）, a nano-crystalline （NC） surface layer was obtained on Cu-4Ti alloy. The microstructure features of various sections in the surface layer, from the strain-free matrix to the treated top surface, were systematically characterized by using X-ray diffraction （XRD） analysis, scanning electron microscopy （SEM） observations and micro- hardness test. The results show that the average grain size on the surface layer is about 40.72 nm and 17.12 nm for the sample treated for 45 min and 60 min, respectively. The stratification layer of Cu-4Ti alloy after SMAT is obvious, differs a significant way from the gradient microstructure in previous work. Experimental evidences also indicate that the SMAT treatment plays an important role in strengthening surface of the alloy. The microhardness of the top nano-structured surface layer in Cu-4Ti alloy plates with SMAT for 45 min and 60 min are about 51% and 56% higher than those of the Cu-4Ti matrix, respectively.

关 键 词：铜钛合金 表面机械研磨处理 显微结构 显微硬度 

分 类 号：TG146.1[一般工业技术—材料科学与工程]