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首页> 外文期刊>Materials Science and Engineering >A novel ultra-high temperature Pt-Rh alloy with balanced tensile strength and creep resistance achieved by rare-earth intermetallics
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A novel ultra-high temperature Pt-Rh alloy with balanced tensile strength and creep resistance achieved by rare-earth intermetallics

机译：一种新型超高温PT-RH合金，具有稀土化金属间金属间抗拉伸强度和抗蠕变性

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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 °C. Tensile creep tests of the alloy were carried out at 1500 °C under a load of 5 MPa, the high tensile strength (σ_b) was up to 47.8 MPa, the creep rate (ε) as low as 0.008%/h and a rupture time (t) 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 PtsRE (RE = La, Ce) intermetallic phase with a hexagonal structure. The Pt_5RE 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 PtsRE intermetallic phase but rarely in the (Pt, Rh)_(ss) phase. It is interesting to note that the Pt_5RE 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 PtsRE intermetallic phase. By the way, an orientation relationship was identified between the PtsRE and (Pt, Rh)_(ss) phases in the eutectic structure for the first time.
机译：具有次要加入稀土（RE）元素（0.2wt％La和0.2wt％Ce）的新型超高温Pt-25RH（重量％）合金首次开发出可承受的能力具有高工作温度> 1500°C的侵略性环境。合金的拉伸蠕变试验在500℃下在5MPa的载荷下进行，高抗拉强度（σ_b）高达47.8MPa，蠕变率（ε）低至0.008％/ h和破裂时间（t）分别超过53小时。详细的微观结构表征显示，合金中存在两个平衡相，延性（Pt，rH）固溶体，具有面为中心的立方结构和具有六边形结构的强化Ptsre（Re = La，Ce）金属间相。 PT_5RE相位在合金中存在三种形式，沉淀在（Pt，RH）_（SS）基质中，沿晶粒边界的晶间相和基质中的共晶混合物。组成分析表明，在PTSRE金属间相中几乎完全存在的RE元件，但很少在（PT，RH）_（SS）相中。值得注意的是，PT_5RE金属间相位是重新采集的相位，其中RE元素的含量小于5wt％，远低于化学计量比（12.46wt％）。与报道的PT-RH二元合金相比，新合金中的次次添加La和Ce有效改善了其高温机械性能，可归因于强化PTSRE金属间相的形成。顺便说一下，首次在共晶结构中的PTSRE和（Pt，RH）_（SS）相之间鉴定取向关系。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|139966.1-139966.9|共9页
  • 作者

    Min Tian; Changyi Hu; Hongzhong Cai; Xiang Li; Yan Wei; LianLong He;

  • 作者单位

    Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering University of Science and Technology of China Shenyang 110016 China;

    State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals Kunming Institute of Precious Metals Kunming 650106 China;

    State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals Kunming Institute of Precious Metals Kunming 650106 China;

    Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering University of Science and Technology of China Shenyang 110016 China;

    State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals Kunming Institute of Precious Metals Kunming 650106 China;

    Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering University of Science and Technology of China Shenyang 110016 China;

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  • 关键词

    Pt-Rh alloy; Rare earth addition; High-temperature mechanical properties; Intermetallics; TEM;

    机译：Pt-Rh合金;稀土增加;高温机械性能;金属间金属间;TEM;

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