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Zn 对 Mg-Gd-Y-Zr 镁合金微观组织和 力学性能的影响
Effect of Zn-addition on the Microstructure and Mechanical Properties of Mg-Gd-Y-Zr Alloy
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- DOI:
- 作者:
- 田 军 1 ， 2 ，屠 涛 1 ， 2 ，代 盼 3 ，徐春杰 4 ， 5 ，曾建新 1
TIAN Jun 1,2 , TU Tao 1,2 , DAI Pan 3 , XU Chunjie 4,5 , ZENG Jianxin 1
- 作者单位:
- 1. 镁高镁诺奖(铜川)新材料有限公司，陕西 铜川 727031；2. 西安诺高镁防务技术有限公司, 陕西 西安 710076；3. 西安 石油大学 材料科学与工程学院，陕西 西安 710065；4. 西安谢赫特曼诺奖新材料研究院，陕西 西安 710048；5. 西安理 工大学 材料科学与工程学院，陕西 西安 710048
1. Meigaomei Nobel Prize(Tongchuan) New Materials Co., Ltd., Tongchuan 727031, China; 2. Xi'an Nuogaomei Defense Technology Co., Ltd., Xi'an 710076, China; 3. School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China; 4. Xi'an Shechtman Nobel Prize New Materials Institute, Xi'an 710048, China; 5. School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
- 关键词:
- Mg-Gd-Y-Zn-Zr ；微观组织；力学性能
Mg-Gd-Y-Zn-Zr; microstructure; mechanical property
- 摘要:
- Zn 元素的添加对 Mg-Gd-Y-Zr 合金的微观组织和力学性能具有重要影响， 特别是 LPSO 结构的演变对高性能镁合金的产业化应用具有重要的作用。 为研究 Zn 对 Mg-Gd-Y-Zr 合金微观组织演变和性能影响，对不同Zn 元素含量的 Mg-10Gd-4Y-0.5Zr-xZn(x=0, 1, 2, 质量分数， %) 铸棒进行挤压处理，采用 OM 、 SEM 、 XRD 、和 TEM 对挤压试样进行了组织观测， 并对试样的力学性能进行检测。 结果显示， 挤压状态 Mg-10Gd-4Y-0Zn-0.5Zr 由基体α-Mg 和少量的 Mg-RE 微粒相组成。 随着元素 Zn 的添加，试样的相组成变为大量基体 α-Mg 、晶界流线形 LPSO结构、晶粒内部微小层片状 LPSO 及少量随机分布 Mg-RE 微粒相。 随着元素 Zn 的不断增加，晶粒尺寸不断细化，细晶强化效果不断增强，使得试样的强度显著提升，而试样伸长率呈现先增强后减弱的趋势。The addition of Zn has a significant impact on the microstructure and mechanical properties of Mg-Gd-Y-Zr alloy. In particular, the evolution of the LPSO structure plays an important role in the application of high-performance magnesium alloys. To investigate the effect of Zn on the microstructure evolution and properties of the Mg-Gd-Y-Zr alloy, Mg-10Gd-4Y-0.5Zr-xZn(x=0, 1, 2, mass fraction, %) alloys with different Zn contents were prepared by extrusion. The microstructure of the as-extruded alloys was observed by OM, SEM, XRD and TEM, and the tensile properties at room temperature were tested. The results show that the as-extruded alloy without Zn consists of the α-Mg matrix and a small amount of the Mg-RE phase. With the addition of Zn, the alloy consists of α-Mg with lamellar 14H-LPSO in the matrix, linear flow 14H-LPSO at the grain boundary and the Mg-RE phase. The grain size of the as-extruded alloy continuously decreases and the effect of fine grain strengthening increases with increasing Zr content. As a result, the strength of the alloy increases, while the elongation of alloys increases primarily and then weakens with the addition of Zr.