A novel ultra-high temperature Pt-Rh alloy with balanced tensile strength and creep resistance achieved by rare-earth intermetallics

doi:10.1016/j.msea.2020.139966

CORC > 金属研究所 > 中国科学院金属研究所

	A novel ultra-high temperature Pt-Rh alloy with balanced tensile strength and creep resistance achieved by rare-earth intermetallics
	Tian, Min 2,3; Hu, Changyi 1; Cai, Hongzhong 1; Li, Xiang 2,3; Wei, Yan 1; He, LianLong 2,3
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2020-10-21
卷号	797 页码:9
关键词	Pt-Rh alloy Rare earth addition High-temperature mechanical properties Intermetallics TEM
ISSN号	0921-5093
DOI	10.1016/j.msea.2020.139966
通讯作者	Wei, Yan(weiyan@ipm.com.cn) ; He, LianLong(llhe@imr.ac.cn)
英文摘要	A novel ultra-high temperature Pt-25Rh (wt.%) alloy with a minor addition of rare-earth (RE) elements (0.2 wt% La and 0.2 wt% Ce) was developed for the first time which exhibits the capability to withstand aggressive environment with a high operating temperature of >1500 degrees C. Tensile creep tests of the alloy were carried out at 1500 degrees C under a load of 5 MPa, the high tensile strength (sigma(b)) was up to 47.8 MPa, the creep rate (epsilon) as low as 0.008%/h and a rupture time (tau) more than 53 h, respectively. Detailed microstructure characterization revealed that there exist two balanced phases in the alloy, a ductile (Pt, Rh) solid solution phase with a face-centered cubic structure and a strengthening Pt5RE (RE = La, Ce) intermetallic phase with a hexagonal structure. The Pt 5 RE phases present three types of forms in the alloy, precipitates in the (Pt, Rh)(ss) matrix, an intergranular phase along the grain boundaries and a eutectic mixture in the matrix. Composition analysis showed that RE elements almost completely exist in the Pt5RE intermetallic phase but rarely in the (Pt, Rh)(ss) phase. It is interesting to note that the Pt5RE intermetallic phase is a RE-poor phase in which the content of RE elements is less than 5 wt%, much lower than the stoichiometric ratio (12.46 wt%). Compared with the reported Pt-Rh binary alloys, a minor additions of La and Ce in the new alloy effectively improves its high-temperature mechanical properties, which can be attributed to the formation of the strengthening Pt5RE intermetallic phase. By the way, an orientation relationship was identified between the Pt5RE and (Pt, Rh)(ss) phases in the eutectic structure for the first time.
资助项目	Science and Technology Major Project (New Materials) of Yunnan, China[2018ZE001] ; Science and Technology Major Project (New Materials) of Yunnan, China[2019ZE001] ; Natural Science Foundation of Yunnan, China[2019FA048] ; State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, China[SKL-SPM-201805]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000579487100005
资助机构	Science and Technology Major Project (New Materials) of Yunnan, China ; Natural Science Foundation of Yunnan, China ; State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/140992]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wei, Yan; He, LianLong
作者单位	1.Kunming Inst Precious Met, State Key Lab Adv Technol Comprehens Utilizat Pla, Kunming 650106, Yunnan, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Tian, Min,Hu, Changyi,Cai, Hongzhong,et al. A novel ultra-high temperature Pt-Rh alloy with balanced tensile strength and creep resistance achieved by rare-earth intermetallics[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2020,797:9.
APA	Tian, Min,Hu, Changyi,Cai, Hongzhong,Li, Xiang,Wei, Yan,&He, LianLong.(2020).A novel ultra-high temperature Pt-Rh alloy with balanced tensile strength and creep resistance achieved by rare-earth intermetallics.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,797,9.
MLA	Tian, Min,et al."A novel ultra-high temperature Pt-Rh alloy with balanced tensile strength and creep resistance achieved by rare-earth intermetallics".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 797(2020):9.