Effect of Al5Ti1B master alloy on microstructures and properties of AZ61 alloys

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. B07; pp. 397 - 401
• Main Author: 马旭梁 王香 李新林 杨磊
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2010; School of Materials Science and Engineering,Harbin University of Science and Technology,Harbin 150080,China; Center for Biomedical Materials and Engineering,Harbin Engineering University,Harbin 150001,China%Center for Biomedical Materials and Engineering,Harbin Engineering University,Harbin 150001,China
• Subjects: Al5Ti1B master alloy; Alloys; Aluminum base alloys; AZ61 alloys; AZ61镁合金; China; grain refinement; Grain size; Intermetallic compounds; Magnesium base alloys; Master alloys; Microhardness; Microstructure; Nucleation; Solidification; 中间合金; 保温时间; 平均晶粒尺寸; 微观结构; 显微硬度; 非均相成核; grain refinement; AZ61 alloys; microhardness; Al5Ti1B master alloy
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(10)60505-5

AZ61 alloys with different levels of Al5Ti1B master alloy additions were prepared by conventional casting method.The effects of Al5Ti1B contents and holding time on microstructures and microhardness of AZ61 alloys were studied by XRD,OM and microhardness testing techniques.The results show that when the addition level of Al5Ti1B master alloy is less than 0.5%（mass fraction）,the average grain size of the alloys decreases with the increase of Al5Ti1B content at the same holding time.But the grain size increases somewhat with further addition of Al5Ti1B.The average grain size of the alloys decreases with the increase of the holding time as it is less than 30 min at the same addition level of Al5Ti1B.It is considered that TiB2 particles can serve as the heterogeneous nucleation sites ofα-Mg during solidification,and heterogeneous nucleation is the main reason for the grain refinement of AZ61 alloys.The microhardness of the refined AZ61 alloys with 1.0%Al5Ti1B addition is increased by about 8%.