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中文摘要：
开发出一种新颖的A356铝合金半固态加工技术——蛇形通道浇注流变压铸技术（SCRC）。采用SCRC技术制备A356铝合金拉伸试样,并研究试样在铸态和T6热处理条件下的力学性能和微观组织。结果表明：在铸态下拉伸试样的抗拉强度可达到250MPa左右,伸长率在8.6%-13.2%;经过T6热处理后,抗拉强度可提高约30%,但伸长率略有下降。在这些实验条件下,蛇形通道浇注技术可制备出初生α1（Al）的形状因子为0.78-0.89和晶粒尺寸为35-45μm的优质半固态A356铝合金浆料。与传统压铸工艺相比,SCRC技术可改善拉伸试样的微观组织并提高它的力学性能。这种SCRC技术具有与传统压铸设备衔接简便、取消了半固态浆料的保存及输送步骤和具有较高的性价比等优点。
英文摘要：
An innovative one-step semi-solid processing technique of A356 Al alloy,the serpentine channel pouring rheo-diecasting process （SCRC）,was explored.The mechanical properties and microstructures of the tensile samples made by the SCRC technique were tested in the as-cast and T6 heat treatment conditions.The experimental results show that the as-cast ultimate tensile strength can reach about 250MPa and the elongation is 8.6%？13.2%.The ultimate tensile strength can increase approximately 30% higher than that of the as-cast one but there is some slight sacrifice of the plasticity after T6 heat treatment.Under these experimental conditions,the semi-solid A356 Al alloy slurry with primary α1（Al） grains,which have the shape factor of 0.78？0.89 and the grain diameter of 35？45μm,can be prepared by the serpentine channel pouring process.The primary α2（Al） grains are very fine during the secondary solidification stage.Compared with the conventional HPDC process,the SCRC process can improve the microstructures and mechanical properties of the tensile test samples.The advantages of the SCRC process include easily incorporating with an existing HPDC machine,cancelling the preservation and transportation process of the semi-solid alloy slurry,and a higher cost performance.
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