Monotectic four-phase reaction and self-lubricating performance of directionally solidified Ni-Nb-Cu ternary immiscible alloys

doi:10.1016/j.jallcom.2025.179668

IMR OpenIR

	Monotectic four-phase reaction and self-lubricating performance of directionally solidified Ni-Nb-Cu ternary immiscible alloys
	Fan, Kangqi 1,2; Hua, Zhihui 1,2; Zhang, Lili 1; Yang, Pengju 1,2; He, Jie 1,2
通讯作者	He, Jie(jiehe@imr.ac.cn)
	2025-04-05
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	1021 页码:11
摘要	The monotectic four-phase equilibrium reaction L"-> L" +S1 +S2 of ternary immiscible alloys provides a new window for the one-step design of novel in-situ composites. In this work, a differential scanning calorimetry (DSC) study was performed for the Ni-Nb-Cu alloys to find the ternary monotectic composition point Ni48.5Nb39Cu12.5 and determine the four-phase reaction L"-> L"(CuL) +Ni3Nb +Ni6Nb7 at 1134 degrees C. Subsequently, continuous directional solidification experiments were carried out for the monotectic-point alloy. The results indicate that the microstructure of the rod sample is of in-situ composite characteristic with Cu-rich soft particles embedded in eutectic-like hard Ni3Nb and Ni6Nb7 compounds. The average size of the Cu-rich particles and the interlamellar spacing of the Ni3Nb compound decrease with the increase of the withdrawal rate. The formation mechanism of the composite structure at the solidifying front was discussed in detail. The interaction between the eutectic-like microstructure with the Cu-rich droplets depends on the solute diffusion, interfacial wetting, and droplet migration. The Cu-rich droplets prefer to wet the Ni3Nb compound, and interfacial bonding properties among the Ni3Nb, Ni6Nb7 and Cu-rich phases were characterized. The measurements of hardness and wear characteristics indicate that the Vickers hardness and wear resistance of the samples significantly increase with the increase of the withdrawal rate. The combination of the well-dispersed soft Cu-rich particles as solid lubricant and the hard Ni3Nb and Ni6Nb7 compounds as strong matrix causes that the Ni-Nb-Cu monotectic alloy exhibits high self-lubricating and wear-resistance performances.
关键词	Monotectic alloys Four-phase monotectic reaction Liquid-state phase separation Directional solidification Self-lubricating performance
资助者	National Natural Science Foundation of China ; Space Utilization System of China Manned Space Engineering ; Science and Technology Project of Yunnan Province ; Natural Science Foundation of Liaoning Province
DOI	10.1016/j.jallcom.2025.179668
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[52174280] ; National Natural Science Foundation of China[51974288] ; Space Utilization System of China Manned Space Engineering[KJZ-YY-NCL06] ; Science and Technology Project of Yunnan Province[202301BC070001-021] ; Natural Science Foundation of Liaoning Province[2023-MS-023]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001446285500001
出版者	ELSEVIER SCIENCE SA
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/192022
专题	中国科学院金属研究所
通讯作者	He, Jie
作者单位	1.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Fan, Kangqi,Hua, Zhihui,Zhang, Lili,et al. Monotectic four-phase reaction and self-lubricating performance of directionally solidified Ni-Nb-Cu ternary immiscible alloys[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2025,1021:11.
APA	Fan, Kangqi,Hua, Zhihui,Zhang, Lili,Yang, Pengju,&He, Jie.(2025).Monotectic four-phase reaction and self-lubricating performance of directionally solidified Ni-Nb-Cu ternary immiscible alloys.JOURNAL OF ALLOYS AND COMPOUNDS,1021,11.
MLA	Fan, Kangqi,et al."Monotectic four-phase reaction and self-lubricating performance of directionally solidified Ni-Nb-Cu ternary immiscible alloys".JOURNAL OF ALLOYS AND COMPOUNDS 1021(2025):11.