不同比压下流变挤压铸造ZL111铝合金的性能与组织

Properties and Microstructure of Rheological Squeeze Casting Aluminum Alloy under Different Pressure

采用流变间接挤压铸造技术,研究了ZL111铝合金制动泵缸体的成形工艺。通过金相组织观察、拉伸试验、断口分析以及TEM分析等手段,研究了压射比压对铝合金制动泵缸体组织和性能的影响。结果表明,压射比压的增加,消除了铸件因补缩不足而产生的缩松;当压射比压由80MPa增加至95MPa,铸件的显微组织得到了细化,晶粒的平均尺寸由149μm减少至99μm,铸件的抗拉强度和伸长率分别达到了371 MPa和3.17%。

ZL1 1 1 aluminum alloy brake pump cylinder was produced by rheological indirect squeeze cast-ing .Influence of inj ection specific pressure on the quality of brake pump cylinder was analyzed by X-ray detection,metallographic analysis and tensile test,TEM.The results reveal that with the increase of the injection specific pressure,the shrinkage porosities in casting are eliminated.With the injection spe-cific pressure increased from 80 MPa to 95 MPa,the average grain size is decreased from 149μm to 99μm,and tensile strength and elongation of castings reach 371 MPa and 3.17% ,respectively.