Study on the Influence of Surface Hardened Layer of Solid Substrate on the Structure and Properties of Liquid-Solid Cast-Rolled 1070A/7075 Composite Sheet
Three different materials including brazing diamond bowl grinding disc,steel wire brushing and louver blades were used to polish 7075 aluminium alloy substrates,and the 7075 aluminium alloy substrates with different surface work-hardened layer states were prepared.Then liquid-solid casting and rolling was used to prepare 1070A/7075 aluminium alloy composite sheets.The effect of the work-hardened layer state on the structure and properties of 1070A/7075 aluminium alloy composite sheets under different grinding methods was explored.The results show that the thickness of the hardened layer of the composite sheet under the three mechanical grinding methods is louver blades(45 μm)>steel wire brush(25 μm)>brazed diamond bowl grinding disc(15 μm),and the diffu-sion distance of the elements of the 1070A/7075 aluminium alloy composite sheet with solid substrate processed by the brazed dia-mond bowl grinding disc is 7.5 μm,and the bonding strength is 55.2 MPa.
work hardeningliquid-solid cast-rolling1070A/7075 composite sheet
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