论文部分内容阅读
对2A12硬质铝合金表面进行超音速微粒轰击处理,在材料表层获得纳米晶组织。利用X射线衍射、光学电镜、透射电镜和显微硬度测试技术对试样的微观结构和性能进行测试分析,并对表面纳米化的形成机理及其性能作了初步探讨。结果表明:在强度0.15A、压强0.3MPa和时间60min条件下对2A12铝合金进行超音速微粒轰击为优化工艺,最小平均晶粒尺寸为56nm,随处理时间的延长,晶粒尺寸缓慢减小并逐渐趋于稳定;随距表面距离的增加,晶粒逐渐由随机取向的等轴状纳米晶变成具有择优取向的不规则形状的亚微米晶,晶粒细化程度逐渐变得不均匀。
2A12 hard aluminum alloy surface by supersonic particle bombardment treatment, obtained in the material nanocrystalline surface microstructure. The microstructure and properties of the samples were analyzed by X-ray diffraction, optical electron microscopy, transmission electron microscopy and microhardness test. The forming mechanism and properties of the nano-scale were also discussed. The results show that supersonic particle bombardment of 2A12 aluminum alloy under the conditions of 0.15A of strength, 0.3MPa of pressure and 60min of time is the optimum process, the minimum average grain size is 56nm, and the grain size decreases slowly with the increase of treatment time Gradually became stable. With the increase of distance from the surface, the grains gradually changed from randomly oriented equiaxed nanocrystals into irregularly shaped submicron grains with preferred orientation, and the degree of grain refinement gradually became uneven.