【摘要】 考察了Al 1B中间合金对 0 .0 30 %Sr变质的Al 11.6 %Si 0 .4 %Mg合金组织和力学性能的影响。发现Al B中间合金在近共晶铸造Al Si合金中具有优异的枝晶细化能力。通过比较 3种不同熔体处理条件下 (未变质 +未枝晶细化处理、0 .0 30 %Sr变质处理、0 .0 30 %Sr+0 .0 2 8%B联合熔体处理 )合金铸态和T6状态下的力学性能并对断口形貌进行分析 ,可以得出在近共晶铸造Al Si合金中同时加入Sr ,B进行枝晶细化和共晶Si变质联合处理是十分必要的更多还原

【Abstract】 The influence of addition of Al 1B master alloy on the microstructure and mechanical properties of Al 11.6%Si 0.4%Mg alloy modified with 0.030%Sr were discussed. It is found that the Al B master alloy has a very strong power of refining dendrite in near eutectic Al Si casting alloys. The mechanical properties and the fractographs of the alloy as cast and after T6 heat treatment by three different melt treatments (no modifying+no refining, 0.030%Sr modifying, 0.030% Sr modifying+ 0.028%B refining) were also compared. It is concluded that the combined melt treatment of Sr+B is very necessary and important to improve the mechanical properties of the near eutectic Al Si casting alloys, especially the ductility.更多还原