Microstructure and mechanical properties of Mg-1Gd(Nd)-0.6Zr magnesium alloy

doi:10.13251/j.issn.0254-6051.2023.10.033

Abstract

Abstract: Microstructures and mechanical properties of the as-cast, as-extruded and as-aged Mg-1Gd-0.6Zr and Mg-1Nd-0.6Zr magnesium alloys at room temperature were studied by means of optical microscopy, scanning electron microscopy, energy spectrum analysis, X-ray diffraction and tensile test. The results show that the average grain size of the Mg-1Gd-0.6Zr and Mg-1Nd-0.6Zr alloys is smaller than that of the Mg-0.6Zr alloy, which is refined from 300 μm to about 100 μm and 80 μm, respectively. Moreover, a small amount of granular phase Mg₅Gd and irregular shaped Mg₄₁Nd₅ and Mg₁₂Nd phases are distributed at grain boundaries, respectively. The extruded Mg-1Gd-0.6Zr and Mg-1Nd-0.6Zr alloys exhibit typical bimodal microstructure composed of deformed grains and dynamic recrystallized grains, and in particular, the bimodal microstructure is more obvious after aging. The mechanical properties of the as-aged Mg-1Nd-0.6Zr alloy are the best, the tensile strength is 201.71 MPa, which is 3.6% higher than that of the as-extruded alloy, 23% higher than that of the as-cast alloy and 2% higher than that of the as-aged Mg-1Gd-0.6Zr alloy. The elongation of the as-aged Mg-1Nd-0.6Zr alloy is 29.2%, which is 4.3% higher than that of the as-extruded alloy, 46% higher than that of the as-cast alloy and 15.4% higher than that of as-aged Mg-1Gd-0.6Zr alloy.

Key words: Mg-1Gd-0.6Zr magnesium alloy, Mg-1Nd-0.6Zr magnesium alloy, bimodal microstructure, mechanical properties

CLC Number:

TG146.2

Zhang Wenyu, Wu Yuanzhi, Ye Tuo, Du Weixiao, Liu Xianlan, Zhao Longfei, Wu Yuanzhen, Quan Yang. Microstructure and mechanical properties of Mg-1Gd(Nd)-0.6Zr magnesium alloy[J]. Heat Treatment of Metals, 2023, 48(10): 215-220.

References

[1]陈振华, 严红革, 陈吉华, 等. 镁合金[M]. 北京: 化学工业出版社, 2004.
[2]程子洲, 赵莉萍, 王小青, 等. 稀土镁合金的研发及应用现状[J]. 稀土信息, 2022(5): 30-35.
[3]罗晓东, 张德洲, 陈小雨, 等. 稀土元素改善镁合金组织性能研究进展[J]. 中国稀土学报, 2023, 41(2): 244-255.
Luo Xiaodong, Zhang Dezhou, Chen Xiaoyu, et al. Research progress of rare earth element in improving microstructure and properties of magnesium alloys[J]. Journal of the Chinese Society of Rare Earths, 2023, 41(2): 244-255.
[4]吴国华, 童鑫, 眭怀明, 等. 铸造镁稀土合金研究现状及其在航空发动机领域应用展望[J]. 航空制造技术, 2022, 65(3): 14-29.
Wu Guohua, Tong Xin, Sui Huaiming, et al. Research status of cast Mg-RE alloy and its application prospect in aero-engine[J]. Aeronautical Manufacturing Technology, 2022, 65(3): 14-29.
[5]曾小勤, 陈义文, 王静雅, 等. 高性能稀土镁合金研究新进展[J]. 中国有色金属学报, 2021, 31(11): 2963-2975.
Zeng Xiaoqin, Chen Yiwen, Wang Jingya, et al. Research progress of high-performance rare earth magnesium alloys[J]. The Chinese Journal of Nonferrous Metals, 2021, 31(11): 2963-2975.
[6]陈利超, 王长喜, 苏植成, 等. 时效工艺对WE43镁合金组织与力学性能的影响[J]. 金属热处理, 2022, 47(5): 208-212.
Chen Lichao, Wang Changxi, Su Zhicheng, et al. Effect of aging process on microstructure and mechanical properties of WE43 magnesium alloy[J]. Heat Treatment of Metals, 2022, 47(5): 208-212.
[7]张子延, 陈君, 陈晓亚, 等. 固溶时效处理对Mg-4Sm-3Gd-0.5Zr合金显微组织和耐蚀性能的影响[J]. 金属热处理, 2022, 47(4): 10-16.
Zhang Ziyan, Chen Jun, Chen Xiaoya, et al. Effect of solution aging treatment on microstructure and corrosion resistance of Mg-4Sm-3Gd-0.5Zr alloy[J]. Heat Treatment of Metals, 2022, 47(4): 10-16.
[8]吴晓宝, 张星, 张晋禄. 固溶工艺对挤压态Mg-9.2Gd-1.9Y-1.8Zn-0.5Zr合金组织和硬度的影响[J]. 金属热处理, 2021, 46(3): 80-85.
Wu Xiaobao, Zhang Xing, Zhang Jinlu. Effect of solution treatment process on microstructure and hardness of as-extruded Mg-9.2Gd-1.9Y-1.8Zn-0.5Zr alloy[J]. Heat Treatment of Metals, 2021, 46(3): 80-85.
[9]许恒源, 甄睿, 毛忠峰, 等. 热处理对挤压态Mg-6Gd-5Y-1Zn合金组织与性能的影响[J]. 金属热处理, 2020, 45(8): 161-165.
Xu Hengyuan, Zhen Rui, Mao Zhongfeng, et al. Effect of heat treatment on microstructure and properties of as-extruded Mg-6Gd-5Y-1Zn alloy[J]. Heat Treatment of Metals, 2020, 45(8): 161-165.
[10]张慧敏, 陈立超, 赵莉萍. 稀土Nd对AE镁合金显微组织及硬度的影响[J]. 金属热处理, 2019, 44(7): 84-87.
Zhang Huimin, Chen Lichao, Zhao Liping. Effect of rare earth Nd on microstructure and hardness of AE magnesium alloy[J]. Heat Treatment of Metals, 2019, 44(7): 84-87.
[11]章懿清, 汪丽佳, 胡励, 等. Mg-8. 5Gd-4. 5Y-0. 8Zn-0. 4Zr稀土镁合金室温包套压缩变形行为及变形机制[J]. 中国有色金属学报, 2022 (10): 1-15.
Zhang Yiqing, Wang Lijia, Hu Li, et al. Deformation behavior and mechanisms of Mg-8. 5Gd-4. 5Y-0. 8Zn-0. 4Zr rare earth magnesium alloy undergoing canning compression at room temperature[J]. The Chinese Journal of Nonferrous Metals, 2022(10): 1-15.
[12]黄元春, 王舟, 马尚坤. 均匀化处理对Mg-9.8Gd-3.5Y-2Zn-0.5Zr合金微观组织的影响[J]. 金属热处理, 2022, 47(10): 1-9.
Huang Yuanchun, Wang Zhou, Ma Shangkun. Effect of homogenization treatment on microstructure of Mg-9.8Gd-3.5Y-2Zn-0.5Zr alloy[J]. Heat Treatment of Metals, 2022, 47(10): 1-9.
[13]刘楚明, 朱秀荣, 周海涛. 镁合金相图集[M]. 长沙: 中南大学出版社, 2006.
[14]Wang Can, Han Peide, Zhang Lu, et al. First-principles study on the stabilities of the intermetallic compounds in Mg-Nd alloys[J]. Rare Metal Materials and Engineering, 2011, 40(4): 590-594.
[15]Zheng Liuwei, Zhuang Yongpeng, Li Junjian, et al. Mechanical properties of Mg-Gd-Zr alloy by Nd addition combined with hot extrusion[J]. Transactions of Nonferrous Metals Society of China, 2022, 32(6): 1866-1880.
[16]汤伊金, 章桢彦, 靳丽, 等. Mg-Gd系合金时效析出研究进展[J]. 中国有色金属学报, 2014, 24(1): 8-24.
Tang Yijin, Zhang Zhenyan, Jin Li, et al. Research progress on aging precipitation of Mg-Gd alloys[J]. The Chinese Journal of Nonferrous Metals, 2014, 24(1): 8-24.
[17]梅婉婉, 李全安, 陈晓亚, 等. Mg-Gd系合金的塑性改善研究现状[J]. 中国稀土学报, 2023, 41(4): 674-690.
Mei Wanwan, Li Quanan, Chen Xiaoya, et al. Research status of plasticity improvement of Mg-Gd alloys[J]. Journal of the Chinese Society of Rare Earths, 2023, 41(4): 674-690.
[18]薛山. 含Nd耐热镁合金显微组织和性能的研究[D]. 南京: 东南大学, 2006.
Xue Shan. Investigation on microstructure and properties of magnesium heat resistant alloys with Nd additions[D]. Nanjing: Southeast University, 2006.
[19]孙亚伟, 陈思远, 胡鸿彪, 等. 双峰晶粒结构AZ80镁合金的制备与组织性能[J]. 塑性工程学报, 2022, 29(7): 101-106.
Sun Yawei, Chen Siyuan, Hu Hongbiao, et al. Preparation, microstructure and properties of AZ80 magnesium alloy with bimodal grain size[J]. Journal of Plasticity Engineering, 2022, 29(7): 101-106.
[20]陈佳俊, 唐昌平, 谢红梅, 等. 双峰分布晶粒在铜、铝、镁合金中的研究进展[J]. 材料热处理学报, 2022, 43(3): 1-10.
Chen Jiajun, Tang Changping, Xie Hongmei, et al. Research progress of bimodal-grain structure in copper, aluminum and magnesium Alloys[J]. Transactions of Materials and Heat Treatment, 2022, 43(3): 1-10.