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中文摘要：
对Cu-4Ti合金分别进行45min和60min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-dTi合金经表面机械研磨处理45rain和60min后，表层晶粒尺寸分别达到了40．72nm和17．12nm，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SMAT45min和60min后，表面硬度比基体分别提高了51％和56％。
英文摘要：
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.
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Effect of temperature on impact properties and microstructural evolution of twinning induced plastic
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