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均匀化退火处理对 Mg-10Gd-4Y-1Zn-0.5Zr 合金微观组织的影响
Effect of Homogenization Annealing on the Microstructure of Mg-10Gd-4Y-1Zn-0.5Zr Alloy
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- DOI:
- 作者:
- 田 军 ，屠 涛，代 盼 ，徐春杰 ，曾建新
TIAN Jun，TU Tao，DAI Pan ， XU Chunjie ， ZENG Jianxin
- 作者单位:
- 镁高镁诺奖(铜川)新材料有限公司，西安诺高镁防务技术有限公司，西安 石油大学 材料科学与工程学院，西安谢赫特曼诺奖新材料研究院， 西安理 工大学 材料科学与工程学院
Meigaomei Nobel Prize (Tongchuan) New Materials Co., Ltd., Xi'an Nuogaomei Defense Technology Co., Ltd.,China School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an Shechtman Nobel Prize New Materials Institute, School of Materials Science and Engineering, Xi'an University of Technology
- 关键词:
- Mg-10Gd-4Y-1Zn-0.5Zr ；微观组织；均匀化退火； LPSO 结构
Mg-10Gd-4Y-1Zn-0.5Zr; microstructure; homogenization annealing; LPSO structure
- 摘要:
- 均匀化退火处理对 Mg-Gd-Y-Zn-Zr 合金的微观组织具有重要影响，特别是 LPSO 结构的演变对于稀土镁合金的推广应用具有重要的作用。 为研究均匀化退火处理对 Mg-Gd-Y-Zn-Zr 合金组织演变的影响，采用氩气保护真空电阻炉熔铸 Mg-10Gd-4Y-1Zn-0.5Zr( 质量分数， %) 铸棒，随后进行均匀化退火处理，并采用光学、扫描电子及透 射电 子显微镜对铸态和均匀化退火态试样进行显微组织分析。 结果显示， 铸造态试样由少量随机散布的孤岛状Mg 5.05 (Gd,Y,Zn) 微粒相、粗大块状 Mg 10 (Gd,Y)Zn 共晶相、少量 Mg-RE 微粒相及大量粗壮基体 α-Mg 组成，平均晶粒 尺寸为 91.2 μm ；均匀化退火态合金由基体 α-Mg 和 Mg 12 (Gd,Y)Zn 及 Mg-RE 等第二相组成，平均晶粒尺寸为142.1 μm 。相较铸态，均匀化退火态晶粒发生显著生长，晶界处粗大的块状 Mg 5 (Gd,Y,Zn) 共晶相和 18R-LPSO 结构转变为晶粒内部细小层片状 14H-LPSO 结构，基体中的 LPSO 结构数量增多，形貌由粗大块状演变为密集细小的层片状，且未有高密度位错和第二相，表明均匀化退火过程有效促进了合金的软化，对后续塑性加工的进行有重要作用。The homogenization annealing treatment has an important effect on the microstructure of Mg-Gd-Y-Zn-Zr alloys. In particular, the evolution of the LPSO structure plays an important role in the application of rare earth magnesium alloys. To study the effect of homogenization annealing on the microstructure evolution of the Mg-10Gd-4Y-1Zn-0.5Zr (mass fraction, %) alloy, the alloy was prepared by casting with vacuum argon protection in an electric-resistance furnace, followed by homogenization annealing. The microstructures of the as-cast and homogenized alloys were observed by OM, SEM and TEM. The results show that the as-cast alloy consists of a small amount of randomly dispersed island-like Mg 5.05 (Gd,Y,Zn) phase, coarse bulk Mg 10 (Gd,Y)Zn eutectic phase, Mg-RE particles and a large amount of coarse matrix α-Mg, with an average grain size of 91.2 μm. The α-Mg matrix, Mg 12 (Gd,Y)Zn eutectic phase and granular Mg-RE phase appear within the homogenized alloy, with an average grain size of 142.1 μm. The grains of the homogenized alloy grow significantly, and the coarse block Mg 5.05 (Gd , Y , Zn ) eutectic phase and 18R-LPSO structure at the grain boundary are transformed into the fine lamellar 14H-LPSO structure in the grains. The homogenized alloy contains more LPSO phase, of which the morphology evolves from coarse block to dense and fine lamellar and lacks high density dislocations and second phases compared with the as-cast alloy, indicating that the homogenization annealing process effectively promotes the softening of the alloy and plays an important role in the subsequent plastic processing.