摘要
对低压浸渗、挤压比为 10∶ 1的热挤压以及固溶处理制备的 Si CW/ Zn- 2 2 Al复合材料的组织与高温变形行为进行了研究。结果表明 :Si CW的复合使材料中出现了熔点为 6 5 5 K的低熔点共晶组织 ,显著提高了变形抗力 ,降低了塑性 ,并使材料丧失了在共析温度区的超塑性 ;在出现适量液相的共晶温度区 。
In this paper, the microstructure and tensile deformation of SiC whisker reinforced Zn 22Al alloy composite, fabricated by pressure infiltration and solute treatment after extrusion with a low extrusion rate of only 10∶1, were investigated. The distribution of SiC whiskers is homogeneous and approximately aligns in the direction of extrusion. An eutectic microstructure, high tensile strength and low tensile elongation were observed after the addition of SiC whisker. The composite exhibits a tensile elongation of only 40% at 538 K while the Zn 22Al alloy is capable of 1 160%. It also shows superplasticity with the tensile elongation of 120%～150% and a strain rate sensitivity of about 0 33 in the initial strain rate of 6 67×10 -2 s -1 at 653～658 K under which an appropriate amount of liquid phase will exist in the composite.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2003年第3期128-130,共3页
Transactions of the Chinese Society for Agricultural Machinery
