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Mg-6.4La-4.87Al镁合金的金属型和 压铸组织与性能
Effects of Microstructures and Mechanical Properties of Ferritic Ductile Iron by Increasing Inoculation Content
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- DOI:
- 作者:
- 李 潇 1， 2 ，黄正华 2 ，徐春杰 1 ，张忠明 1 ，雷 宇 1，2 ，刘思琦 1，2 ，徐
LI Xiao1,2, HUANG Zhenghua2 , XU Chunjie1 , ZHANG Zhongming1 , LEI Yu1,2, LIU Siqi1,2, XU Tao3 , YAN
- 作者单位:
- 1. 西安理工大学 材料科学与工程学院，陕西 西安 710048；2. 广东省科学院材料与加工研究所 广东省金属强韧化技术 与应用重点实验室，粤港轻合金先进制造技术联合研发中心，广东 广州 510650；3. 嘉瑞科技（惠州）有限公司，广东 惠 州 516083；4. 东莞宜安科技股份有限公司，广东 东莞 523662
1. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China; 2.Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Guangdong-Hong Kong Joint Research and Development Center on Advanced Manufacturing Technology for Light Alloys, Institute of Materials and Processing, Guangdong Academy of Sciences, Guangzhou 510650, China; 3. KaShui Technology (Huizhou) Co., Ltd., Huizhou 516083, China; 4. Dongguan EONTEC Co., Ltd., Dongguan 523662, China
- 关键词:
- 稀土镁合金；压铸态；微观组织；力学性能；导热性能；流动性能
Mg-rare earth alloys; die cast; microstructure; mechanical properties; thermal conductivity; fluidity
- 摘要:
- 制备铸态与压铸态 Mg-6.48La-4.87Al 两种合金试样，采用 OM、SEM 和 XRD 分析其微观组织和相组成，
并测试室温拉伸与压缩力学性能、导热性能和流动性能。 结果表明：铸态晶粒粗大，第二相分布不均匀；经传统压铸后，
晶粒变得细小，第二相分布均匀。 两者试样微观组织均主要由 α-Mg 基体、点状 Al11La3 相和少量针状 Mg12La 相组成。 铸
态试样抗拉强度、抗压强度和伸长率分别为 157 MPa、263 MPa 和 4.0%，经压铸后试样抗拉强度、抗压强度和伸长率分
别 提 高 至 236 MPa、345 MPa 和 4.5%，较铸态值分别提高 63%、31%和 13%，同时呈现较好的流动性能 ，流 动 长 度
为 1 374 mm。 铸态试样导热系数达到 113.2 W/(m·K)，经压铸后仍能保持较高的导热系数，为 90.9 W/(m·K)。
The as-cast and die-cast Mg-6.48La-4.87Al alloy samples were prepared. The microstructure and phase composition of the as-cast and die-cast Mg-6.48La-4.87Al alloy samples were analyzed by OM, SEM and XRD, and the mechanical properties, thermal conductivity and flow properties of the as-cast and die-cast Mg-6.48La-4.87Al alloy samples were tested at room temperature. The results show that the as-cast grain is coarse and the distribution of the second phase is not uniform. After traditional die-casting, the grains become fine and the second phase is evenly distributed. The microstructure of both samples is mainly composed of α-Mg matrix, punctate Al11La3 phase and a small amount of acicular Mg12La phase. The tensile strength, compressive strength and elongation of the as-cast samples are 157 MPa, 263 MPa and 4.0% , respectively. After die-casting, the tensile strength, compressive strength and elongation of the as-cast samples are increased to 236 MPa, 345 MPa and 4.5%, respectively, which are 63%, 31% and 13% higher than the as-cast values, respectively. At the same time, they show good flow performance. The flow length is 1 374 mm. The thermal conductivity of the as-cast sample reaches 113.2 W/(m·K), and it can still maintain a high thermal conductivity of 90.9 W/(m·K) after die-casting.