铝合金高频窄脉冲电化学抛光的研究

为了研究铝合金高频窄脉冲电流电化学抛光中各抛光工艺参数与表面粗糙度之间的关系,采用正交试验法安排脉宽、抛光电压和抛光间隙等抛光工艺参数,用极差分析法初步定性地分析了各参数对表面质量影响的大小,然后运用逐步回归分析的方法建立教学模型,最终确定四次函数的回归方程(最优回归方程)为数学模型,并通过单因素试验验证了数学模型的可靠性,从而可对各工艺参数与表面粗糙度的关系作定量分析,为铝合金脉冲电流电化学抛光的研究和推广应用打下了一定的理论基础.     

Effect of yttrium on microstructures and mechanical properties of hot rolled AZ61 wrought magnesium alloy

1 Introduction Magnesium alloys are attractive materials due to their good specific properties such as low density, good damping characteristics, good thermal conductivity and high elastic modulus[1,2]. Recently, there has been significant increase in the…     

Effect of Cu on microstructure,mechanical properties,and texture evolution of ZK60 alloy fabricated by hot extrusion−shearing process

As-cast Mg−6Zn−xCu−0.6Zr (x=0, 0.5, 1.0, wt.%) alloys were fabricated by permanent mold casting; then, the alloys were subjected to homogenization heat treatment and extrusion−shearing (ES) process. The microstructure and mechanical properties of the alloys were evaluated by OM, SEM/EDS, XRD, TEM, EBSD and tensile tests. The results show that the hard MgZnCu phase in Cu-added alloy can strengthen particle-stimulated nucleation (PSN) effect and hinder the migration of dynamic recrystallization (DRX) grain boundary at an elevated temperature during ES. The ZK60+0.5Cu alloy shows an optimal tensile strength–ductility combination (UTS of 396 MPa, YS of 313 MPa, and δ=20.3%) owing to strong grain boundary strengthening and improvement of Schmid factor for {0001} basal slip. The aggregation of microvoids around the MgZnCu phase mainly accounts for the lower tensile elongation of ZK60+1.0Cu alloy compared with ZK60 alloy.