Specimens of ZM5 magnesium alloy were dipped into the mixed powder of Al and Zn at (390±5) ℃ for 8 h in argon gas protective environment and subjected to surface diffusion alloying processing (SDAP). The ero...Specimens of ZM5 magnesium alloy were dipped into the mixed powder of Al and Zn at (390±5) ℃ for 8 h in argon gas protective environment and subjected to surface diffusion alloying processing (SDAP). The erosion wear behaviors of ZM5 magnesium alloy before and after SDAP were investigated in two different erosion wear environments: oil and quartz environment; tap water and quartz environment. The surfaces of erosion wear specimens exhibited cutting scratch grooves in the oil and quartz environment. Corrosive attack was weak and cutting wear mechanism was responsible for the mass loss. When the erosion wear medium was changed to tap water and quartz environment, corrosion pits and cracks were obviously observed after erosion wear test. The corrosion from tap water and the scour from quartz intensified mass losses. Compared with the untreated specimens, the application of SDAP improved the erosion wear resistance in the same environment.展开更多
文摘针对ZM5铸镁缺陷补焊难题,开展光纤激光填丝焊接工艺特性研究,并采用SEM及EDS对焊缝组织进行分析。结果表明,激光束离焦量增加至20 mm时,由激光深熔焊变为热导焊模式,焊缝变宽,熔深变小,稀释率降至0.65,焊缝成形良好;随激光功率增加,稀释率变大,润湿角变大;焊接速度减小,稀释率变小。激光功率为2.1 k W,焊接速度v=0.5 m/min,稀释率为0.52,焊缝成形良好。激光热导焊接热输入小,焊缝组织晶粒细化,先析出α-Mg相基体弥散分布β-Mg17Al12与δ-Mg共晶相。
基金Project (2011JY009) supported by Education Department of Shaanxi Province, China
文摘Specimens of ZM5 magnesium alloy were dipped into the mixed powder of Al and Zn at (390±5) ℃ for 8 h in argon gas protective environment and subjected to surface diffusion alloying processing (SDAP). The erosion wear behaviors of ZM5 magnesium alloy before and after SDAP were investigated in two different erosion wear environments: oil and quartz environment; tap water and quartz environment. The surfaces of erosion wear specimens exhibited cutting scratch grooves in the oil and quartz environment. Corrosive attack was weak and cutting wear mechanism was responsible for the mass loss. When the erosion wear medium was changed to tap water and quartz environment, corrosion pits and cracks were obviously observed after erosion wear test. The corrosion from tap water and the scour from quartz intensified mass losses. Compared with the untreated specimens, the application of SDAP improved the erosion wear resistance in the same environment.