超声波作用下双辊铸轧镁合金板带材的力学性能和成形能力（英文）  

Mechanical Properties and Formability of Ultrasonic Treated Twin Roll Casting Magnesium Alloy Sheet

作　　者：余琨[1] 熊汉青[1] 戴翌龙[1] 滕飞[1] 范素峰 乔雪岩 文利[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《稀有金属材料与工程》2017年第3期622-626,共5页Rare Metal Materials and Engineering

基　　金：Open Fund of the State Key Laboratory of Powder Metallurgy

摘　　要：研究了超声波对双辊铸轧的Mg-3%Al-1%Zn-0.8%Ce-0.3%Mn(质量分数)合金板带材组织和性能的影响。结果表明:超声波辅助镁合金的铸轧可以提高镁合金带材的强度、延伸率和极限深拉比值,在250℃镁合金带材的极限深拉比值可以达到2.16。这些镁合金力学性能和成形能力的提升是由于超声波铸轧过程中,超声波可以细化镁基体的晶粒尺寸,并同时对合金中的Mg_(17)(Al,Zn)_(12)和AlCeMn相起到变质作用。当超声波强度达到800 W时,镁基体的晶粒尺寸可以从150μm细化到30μm,而且针状的AlCeMn相可以被变质成球状,从而提高了镁合金的力学性能和成形能力。The effects of ultrasonic treatment on the microstructure and properties of twin roll casting Mg-2.45%Al-0.92%Zn-0.69%Ce-0.21%Mn alloy strip were studied. The results show that the ultrasonic treatment improves strength, elongation and limiting drawing ratio of the alloy strip. The highest limiting drawing ratio of the sheet is 2.16 at 250 ℃. The improvement of properties is attributed to the refinement of a-Mg grains and the modification of Mg17（Al, Zn）12 and A1CeMn phases by ultrasonic treatment during the twin roll casting process. The grain size of the twin roll casting strip is refined from 150 μm to less than 30 μm with the ultrasonic treatment power of 800 W, and the needle-like shape of the AlCeMn phase is modified to a globular shape; therefore, the mechanical properties and formability of the magnesium alloy sheet are improved.

关 键 词：镁合金 晶粒细化 双辊铸轧 超声波处理 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG335.9[金属学及工艺—金属材料]