Effect of heat treatment temperature on solidification microstructure and hardness of Al-Gd alloy

doi:10.13251/j.issn.0254-6051.2022.08.031

Abstract

Abstract: Al-52%Gd(mass fraction)alloy smelted by vacuum arc furnace was heat treated at different temperatures. The effect of heating temperature on solidification microstructure and hardness of the Al-52%Gd alloy was studied by means of optical microscope, scanning electron microscope, Rockwell hardness tester and so on. The results show that the primary crystal phase changes from coarse developed dendrites to more uniform equiaxed crystals when the heating temperature is 600 ℃. The morphology of eutectic phase transforms from lamellar network to short rod and dot, and the growth mode gradually changes from attaching the primary phase to independence. As the heating temperature increases, the hardness decreases first, then increases and then rapidly decreases. The central hardness value and average hardness value have difference at different heating temperatures, which is mainly determined by the porosity of solidification microstructure as well as the morphology and distribution of primary phase Al₃Gd.

Key words: heat treatment temperature, Al-Gd alloy, solidification microstructure, hardness

CLC Number:

TG166.3

Shi Xiangdong, Li Degui, Cao Alin, Gu Bin, Liang Liuqing. Effect of heat treatment temperature on solidification microstructure and hardness of Al-Gd alloy[J]. Heat Treatment of Metals, 2022, 47(8): 182-187.

References

[1]孙学智, 罗朝晖. 全球乏燃料后处理现状与分析[J]. 核安全, 2016, 15(2): 13-16.
Sun Xuezhi, Luo Zhaohui. Status of global spent fuel reprocessing[J]. Nuclear Safety, 2016, 15(2): 13-16.
[2]霍嘉杰, 郑岳山, 姚琳, 等. 乏燃料干法贮存标准和监管要求浅析[J]. 核安全, 2019, 18(5): 13-18.
Huo Jiajie, Zheng Yueshan, Yao Lin, et al. Analysis of standards and supervision requirement of dry storage for spent fuel[J]. Nuclear Safety, 2019, 18(5): 13-18.
[3]王玉容, 赵勇, 蒋明忠, 等. 功能/结构一体化中子屏蔽材料的研究现状[J]. 精密成形工程, 2019, 2(3): 166-170.
Wang Yurong, Zhao Yong, Jiang Mingzhong, et al. Research status in neutron shielding materials with combined functional and structural performance[J]. Journal of Netshape Forming Engineering, 2019, 2(3): 166-170.
[4]李刚, 简敏, 王美玲, 等. 反应堆乏燃料贮运用中子吸收材料的研究进展[J]. 材料导报A, 2011, 25(7): 110-113.
Li Gang, Jian Min, Wang Meiling, et al. Research progress in neutron absorbers materials for reactor spent fuel storage and transportation applications[J]. Materials Review A, 2011, 25(7): 110-113.
[5]何林, 蔡永军, 李强. 中子和伽马射线综合屏蔽材料研究进展[J]. 材料导报A, 2018, 32(4): 1107-1113.
He Lin, Cai Yongjun, Li Qiang. Research progress in radiation shielding materials serving as the combined barrier against neutron and gamma-ray[J]. Materials Review A, 2018, 32(4): 1107-1113.
[6]Wang W, Xiong L, Zhu H Y, et al. Segregation of B in steel and remelting phenomenon after solidification of SS400B-bearing steel[J]. Journal of Iron and Steel Research, 2015, 27(2): 36-40.
[7]Murari F D, Silva A V, Avillez R R. Cold-rolled multiphase boron steels: Microstructure and mechanical properties[J]. Journal of Materials Research and Technology, 2015, 4(2): 191-196.
[8]Tsubota M, Oikawa M. Boron-bearing stainless steels for thermal neutron shielding[J]. Bullutin of the Iron and Steel Institute of Japan, 2005, 10(12): 25-32.
[9]佴启亮, 郑文杰, 宋志刚, 等. 硼含量对含硼不锈钢组织和性能的影响[J]. 钢铁研究学报, 2013, 25(6): 53-57.
Nai Qiliang, Zheng Wenjie, Song Zhigang, et al. Effect of boron content on microstructure and property of boron stainless steel[J]. Journal of Iron and Steel Research, 2013, 25(6): 53-57.
[10]元琳琳, 韩静涛, 刘靖, 等. 热中子屏蔽用高硼不锈钢复合板的组织与性能[J]. 材料热处理学报, 2015, 36(8): 104-110.
Yuan Linlin, Han Jingtao, Liu Jing, et al. Microstructure and performance of high boron stainless steel composite plate for neutron shielding[J]. Transactions of Materials and Heat Treatment, 2015, 36(8): 104-110.
[11]Electric Power Research Institute. Handbook of neutron absorber materials for spent nuclear fuel transportation and storage applications-2009 edition[R]. American: EPRI, 2009.
[12]Moldovan P, Popesus G. The grain refinement of 6063 aluminum using Al-5Ti-1B and Al-3Ti-0.15C grain refiners[J]. JOM, 2004, 56(11): 59-63.
[13]Electric Power Research Institute. Pressurized water reactor chemically enhanced ultrasonic fuel cleaning: Feasibility study[R]. American: EPRI, 2009.
[14]Machiels A, Lindquist K O. Qualification of METAMIC for Spent Fuel Storage Application[M]. California: Electric Power Research Institute, 2001.
[15]王莉雅. 中子准直器用金属隔片组织与性能的研究[D]. 沈阳: 中国科学院金属研究所, 2015.
Wang Liya. The microstructure and properties of metal spacer for neutron soller collimator[D]. Shenyang: Institute of Metal Research, Chinese Academy of Sciences, 2015.
[16]田娜, 井晓天, 卢正欣, 等. 稀土和镍含量对Al-Gd-Er-Ni金属玻璃初晶化的影响[J]. 材料热处理学报, 2007, 28(3): 39-43.
Tian Na, Jing Xiaotian, Lu Zhengxin, et al. Influence of rare earth and Ni content on the primary crystallization of Al-Gd-Er-Ni metallic glass[J]. Transactions of Materials and Heat Treatment, 2007, 28(3): 39-43.
[17]田瑞, 罗林, 肖学山. 多元Gd(Tb)-Ni-Al合金系中非晶形成能力的成分依赖性研究[J]. 中国稀土学报, 2008, 6(3): 363-367.
Tian Rui, Luo Lin, Xiao Xueshan. Composition dependence of glass-forming ability in Gd(Tb)-Ni-Al alloys[J]. Journal of the Chinese Rare Earth Society, 2008, 6(3): 363-367.
[18]Bykov V, Uporov S, Kulikova T. Thermal conductivity of Al-Gd-TM glass-forming alloys[J]. Transactions of Nonferrous Metals Society of China, 2015, 25: 1911-1916.
[19]静永娟, 张继. 热处理对γ-TiAl合金中Gd化合物的影响研究[J]. 金属功能材料, 2013, 20(3): 32-35.
Jing Yongjuan, Zhang Ji. Effect of heat-treatment on Gd-compound of TiAl alloys[J]. Metallic Functional Material, 2013, 20(3): 32-35.
[20]刘楚明, 蒋树农, 陈志永, 等. 铝合金相图集[M]. 长沙: 中南大学出版社, 2014.
Liu Chuming, Jiang Shunong, Chen Zhiyong, et al. Aluminum Alloy Phase Atlas[M]. Changsha: Central South University Press, 2014.