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A novel ultra-high temperature Pt-Rh alloy with balanced tensile strength and creep resistance achieved by rare-earth intermetallics
Tian, Min; Hu, Changyi; Cai, Hongzhong; Li, Xiang; Wei, Yan; He, LianLong
2020-10-21
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume797
AbstractA 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.
DOI10.1016/j.msea.2020.139966
WOS IDWOS:000579487100005
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/82426
Collection中国科学院金属研究所
Recommended Citation
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.
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.
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).
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