高能超声波处理高硅铝硅合金的组织和力学性能

采用高能超声波对Al-20%Si合金进行熔体处理,研究超声波处理对Al-20%Si合金微观组织形貌及其力学性能的影响。结果表明,在660℃温度下,对Al-20%Si合金熔体进行高能超声波处理,可以使铝硅合金的初晶硅形貌由粗大的板片状逐渐变成细小的球状颗粒,圆整度高,分布均匀,并且使其抗拉强度和延伸率提高。通过对合金拉伸断口形貌的观察,发现在经过超声处理的Al-20%Si合金断口上有较多的撕裂带和韧窝,表现为脆性断裂和韧性断裂的混合型断口。

icrostructure and Mechanical Properties of Hypereutectic Al-Si Alloy Treated by Ultrasonic

The effects of high-intensity ultrasonic treatment on the microstructure and mechanical properties of Al-20%Si are investigated.The results show that treated with high-intensity ultrasonic at 660℃,the coarse plank primary Si is refined and forms into the spherical granules.The primary Si phase in the alloy is well-distributed.The tensile strength and elongation of the alloy are improved.From the fracture surface of the Al-20%Si alloy treated with ultrasonic sound,many tearing slits and dimples can be seen.The characteristic of brittle fracture in combination with toughness fracture is observed.