Microstructure+characteristics+of+assurface+.pdf

V01．15№．3 Trans．NonferrousMet．Soc．China Jun．2005 Article ID：1003—6326(2005)03—0615—04 Microstructurecharacteristicsofas。。surface 1420aluminum shot alloyby peening① high·energy HU WANGKe(王 Lan-qing(胡兰青)1， 科)1一， LIU XU Bin-she(许并社)1 Gang(刘刚)2， ofMaterialsScienceand (1．College Engineering， of 030024，China； TaiyuanUniversityTechnology，Taiyuan 2．InstituteofMetalResearch，Chineseof 110016，China) AcademySciences，Shenyang nanostructuredsurfacewasfabricatedon1420aluminum shot Abstract：A layer alloybyhigh-energypeening． Microstructureswerecharacterized electron byX—raydiffractometer(XRD)，transmission electron microhardnessmeasurementwasconductedthe high-resolutionmicroscope(HRTEM)，and alongdepth fromsurfacetomatrixofthe for30min．Theresultsshowthata about top layer samplepeened nanocrystallinelayer 20 inthicknessisformedonthesurfaceofthe after shot whichthe sizeis gm samplehigh-energypeening，in grain am the of in microstructureconsistsofsub- fromabout20 to100nm．Insurface 20—50 changed layer gmdepth，the micron surface is dislocationmicrohardnessofthe sur— grains．Thenanocrystanizationaccomplishedby slip．The t