搅拌摩擦加工铸态AZ31镁合金组织性能研究(英文)  

Effect of Friction Stir Processing on Microstructure and Mechanical Properties of Cast AZ31 Magnesium Alloy

作　　者：王文[1] 王快社[1] 郭强[1] 吴楠[1] 

机构地区：[1]西安建筑科技大学,陕西西安710055

出　　处：《稀有金属材料与工程》2012年第9期1522-1526,共5页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51074119);Xi'an Science and Technology Project(CXY1124(4))

摘　　要：对铸态AZ31镁合金进行单道次和双道次搅拌摩擦加工,对其微观组织和力学性能进行研究。结果表明:铸态AZ31镁合金搅拌摩擦加工后,共晶网状β-Mg17Al12相破碎并发生固溶,微观组织显著细化和均匀化。AZ31镁合金母材和单道次搅拌摩擦加工后的试样没有择优取向,而双道次搅拌摩擦加工后的试样存在择优取向,其(0002)基平面与试样表面平行。单道次和双道次搅拌摩擦加工后试样的抗拉强度分别提高了43和82MPa,延伸率提高了4.3%和11.9%。搅拌摩擦加工后试样的拉伸断口表现为韧性断裂特征。Cast AZ31 magnesium alloy was treated by the single-pass and two-pass friction stir processing （FSP）, respectively, and the microstructure and mechanical properties were investigated. The results show that FSP causes a remarkable grain refinement and homogenization, and it makes the coarse, network-like eutectic fl-Mgl7All2 phase break up and dissolve into the magnesium matrix. There is no obvious preferential orientation in the cast AZ31 alloy and the single-pass FSP specimen. On the contrary, the two-pass FSP specimen exhibits the preferential grain orientation, and （0002） basal plane shows a strong tendency to be parallel to the plate surface. Further, the ultimate tensile strengths of the single-pass and the two-pass FSP specimens increase by 43 and 82 MPa, and elongations increase by 4.3% and 11.9%, respectively. In the FSP condition, the fracture surface of the AZ31 magnesium alloy ex- hibits ductile fracture characterization.

关 键 词：搅拌摩擦加工 铸态AZ31镁合金 微观组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]