发动机铝合金缸体压铸工艺及力学性能研究

esearch on Die-casting Technology and Mechanical Properties of Aluminum Alloy Cylinder Block for Engine

铝合金具备铸造、伸拉、高耐酸碱度及质轻的优点。发动机缸体是汽车的核心部件,材质大多为铝合金,如何提高铝合金缸体的力学性能,成为迫切需要解决的问题。以A356铝合金为研究对象,通过加入不同含量和加入顺序不同的Si和Mg元素,针对压铸件进行晶粒的细化、破坏晶粒结构处理和合金晶粒组合等多道工序来研究A356的铝合金中Mg和Si含量在压铸的工艺中材料的特性。结论证实:在A356铝合金材料中Si含量的指标处于7.2%,而Mg含量的指标处于0.45%,端面伸长率和断面抗拉的强度处在最佳的状态,端面伸长率和断面抗拉的强度对应是13.6%和9.88%,230Mpa和219Mpa。

Aluminum alloy has the advantages of high strength, good casting performance, high corrosion resistance and light weight. Engine cylinder is the core part of the car, the material is mostly aluminum alloy, how to improve the mechanical properties of aluminum alloy cylinder becomes an urgent problem to be solved. The A356 Aluminum alloy as the research object, through adding different contents and different adding orders of Si and Mg elements for casting fine grain, grain refinement and modification and alloy refining process to study the changes of mechanical properties of Mg Si and A356 content in Aluminum alloy. The results show that the A356 Aluminum alloy, when the Si content reaches 7.2%, the content of Mg reaches 0.45%, the tensile strength and elongation reach the optimal value, tensile strength and elongation of A356 Aluminum alloy were 230Mpa, 13.6% and 219Mpa, 9.88%.