Effect of Homogenization and Extrusion Processing on Mechanical Behavior of an Al-5Mg Alloy
By using homogenization treatment and extrusion processing, a new alloy with fine dispersed network phase and fine crystalline structure was obtained. It was made based on Al-5Mg alloy and dispersed network phase forming element was added in. It had been identified that proper technique such as solution strengthening, dispersion strengthening and fine crystal strengthening can be used to strength the alloy. Mechanical property of a newly developed alloy was tested by tensile and fatigue test, and the fractures were analyzed by scanning electron microscopy (SEM). The microstructures after casting, homogenization treatment and extruding to the alloy were investigated by optical microscopy and SEM.The results show that the strength and the percentage elongation of cast alloy are in the lower level. Homogenization treatment may enhance strength of alloy but lower its percentage elongation. However, the strength and percentage elongation were both increased after extruding. The strength of it was increased by 20％ compared with common 5083 alloy. Primary crystal phase (Ti, V) Al3 is easily become crack source in state of either static or fatigue load were applied, and it may reduce the percentage elongation and fatigue life of alloy. Corrosion resistance of the alloy was interrelated with inclusions (MnFe) Al6 at the grain boundaries. All corrosion point were formed on the boundary of grain with inclusions (MnFe)Al6 at the grain boundaries, when percentage composition of Mn was up to 0.9％ its corrosion resistance was lows down.
aluminum alloy homogenization treatment extrude microstructure mechanical property
Changli Wang Daming Jiang Xiaoping Han
Analysis and Measurement center, Harbin Institute of Technology, Harbin, 150001, PRC.
国际会议
郑州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）