Microstructures and mechanical properties of cold rolled Mg-8Li and Mg-8Li-2Al-2RE alloys

• Published in: Transactions of Nonferrous Metals Society of China 2010-07, Vol.20 (B07), p.550-554
• Main Author: 闫宏 陈荣石 韩恩厚
• Format: Article
• Language: English
• Subjects: Alloys; Elongation; lithium; Magnesium; magnesium alloys; Magnesium base alloys; Mg-Li alloy; microstructure; Rolling direction; Surface layer; Texture; Yield strength; 力学性能; 合金相; 屈服强度; 微结构; 微观结构; 轧制方向
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(10)60536-5

The microstructures and mechanical properties of Mg-8Li and Mg-8Li-2Al-2RE alloy sheets were evaluated after cold rolling.Both alloys contain α-phase and β-phase which consists of a solid solution of Mg in BCC Li.The proportion ofβ-phase in both alloys is approximately 60%.Theα-phase andβ-phase are elongated approximately parallel to the rolling direction and there is no sign of recrystallization even after being annealed at 200℃for 1 h.The yield strength of Mg-8Li-2Al-2RE sheets is about 165 MPa with elongation of 35%along rolling direction,while the yield strength is about 187 MPa with elongation of 21%along the direction titled 45ü to rolling direction.Theα-phase in both alloys exhibits basal texture,and the intensity of basal texture in Mg-8Li is larger than that in Mg-8Li-2Al-2RE.However,theβ-phase shows（100）texture,and the intensity of（100）texture in Mg-8Li is twice of that in Mg-8Li-2Al-2RE.It could be attributed to the existence of RE-containing particles in Mg-8Li-2Al-2RE.