铸造方法对ZL205A-0.1%Sc合金组织和力学性能的影响

Effect of Casting Methods on Microstructure and Mechanical Properties of ZL205A-0.1%Sc

采用砂型和水冷金属型铸造方法分别制备了含0.1%Sc的ZL205A合金试样,并通过力学性能测试,SEM、EDS和TEM等方法研究了铸造方法对合金组织和力学性能的影响。研究结果表明:通过水冷金属型铸造提高冷却速率能抑制脆性W(Al8-xCu4+xSc)相的生成。T6处理后,水冷金属型铸造试样的析出相尺寸稍微变大、数量更多;砂型和水冷金属型铸造条件下ZL205A合金的T6态抗拉强度分别为447.80 MPa和474.64 MPa,延伸率分别为1.60%和10.52%,水冷金属型铸造方法显著提升了合金的延伸率。

ZL205 A alloy specimens containing 0.1%Sc were prepared by sand casting and water-cooled metal casting,respectively.The effects of casting methods on microstructure and mechanical properties of the alloys were studied by means of mechanical property test,SEM,EDS and TEM.The results show that the formation of brittle W(Al8-xCu4+xSc)phase can be inhibited by increasing cooling rate in water-cooled metal mold.After T6 treatment,the size of precipitated phases of the alloy casted in water-cooled metal mold is slightly larger and the amount of precipitated phases increases.T6 tensile strength of ZL205 A alloys casted in sand mold and water-cooled metal mold is 447.8 MPa and 474.64 MPa,and their elongation is 1.60%and 10.52%,respectively.The elongation of the alloy is significantly increased by water-cooled metal mold casting.