热轧对车辆制动盘用SiC增强Mg-Al复合材料组织和性能的影响

Effect of Hot Rolling on Microstructure and Mechanical Properties of SiC Reinforced Mg-Al Composite for Vehicle Brake Disc

为了提高Si C增强Mg-Al复合材料综合性能,采用3道次连轧工艺对复合板材进行了热轧实验,并借助SEM等测试手段研究了不同道次热轧对Si C增强Mg-Al复合材料组织和性能的影响。结果表明：随着热轧道次数的增加,复合板材中的β-Mg17Al12相显著碎化程度增加,经过热轧3道次获得的Si C增强Mg-Al复合材料中的β-Mg17Al12相的碎化效果最好,分布更加均匀。随着热轧道次数的增加,复合板材的显微维氏硬度也随之增大;接触角随之减小。热轧显著地提高了复合板材的抗拉强度和伸长率,3道次热轧的复合板材的抗拉强度达到了253 MPa,伸长率达到了14.22%。热轧后的复合板材拉伸断口中韧窝较多,属于韧性断裂。

In order to improve the comprehensive performance Si C reinforced Mg-Al composite, the hot rolling experiment of composite plate was carried out by using three times rolling process, and the effects of different hot rolling on microstructure and mechanical properties of Si C reinforced Mg-Al composite were researched by means of SEM and other test methods. The results show that the β-Mg17Al12 phase of composite plate fragmentation degree increases significantly with the increase of hot rolling number, and the best and more uniform distribution β-Mg17Al12 phase fragmentation effect is obtained after hot rolling deformation 3 passes Si C reinforced Mg-Al composite. With the increase of hot rolled number, the micro vickers hardness of composite plate also increase and the contact angle is less. Hot rolled deformation significantly improves the tensile strength and elongation of composite plate, with 3 times of hot rolling deformation of the composite plate of tensile strength reaches 253 MPa, the elongation is 14.22%. After hot rolling deformation of composite plate tensile fracture toughness in the nest is more, belonging to the ductile fracture.