首页|Elaborating strengthen mechanism of Pt-Ir solid solution superalloy at finite temperature

Elaborating strengthen mechanism of Pt-Ir solid solution superalloy at finite temperature

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Pt-Ir alloy is potential superalloys used above 1300 ℃ because of their high strength and creep resistance.However,the ductility of Pt-Ir alloy has rapidly deteriorated with the increase of Ir,resulting in poor machinability.This work quantitatively evaluated the solid solution strength-ening(SSS)and grain refinement strengthening(GRS)of Pt-Ir alloy using first-principles calculations combined with experimental characterization.Here,the stretching force constants in the second nearest neighbor region(SFC2nd)of pure Ir(193.7 eV·nm-2)are 3.40 times that of pure Pt(57.0 eV·nm-2),i.e.,the interatomic interaction is greatly enhanced with the increase of Ir content,which leads to the decrease of ductility,and modulus misfit plays a dominant role in SSS.Then,the physical mechanisms responsible for the hardness(Hv)of Pt-Ir alloy,using the power-law-scaled function of electron work function coupled SSS and GRS,are attributed to the electron redistribution caused by different Ir content.Furthermore,a thorough assessment of the thermodynamic characteristics of Pt-Ir binary alloy was conducted,culminating in development of a mapping model that effectively relates composition,temperature and strength.The results revealed that the compressive strength increases with the Ir content,and the highest strength was observed in Pt0.25Ir0.75.This study provides valuable insights into the Pt-Ir alloy system.

Elastic propertiesPhononSolid solution strengthenForce constantsCALPHAD

Wei Yu、Xiao-Yu Chong、Yun-Xuan Zhou、Meng-Di Gan、Ying-Xue Liang、Yan Wei、Ai-Min Zhang、Chang-Yi Hu、Xing-Yu Gao、Li Chen、Hai-Feng Song、Jing Feng

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Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China

Yunnan Precious Metals Laboratory Co.LTD,Kunming 650106,China

Laboratory of Computational Physics,Institute of Applied Physics and Computational Mathematics,Beijing 100088,China

Rare and Precious Metals Material Genetic Engineering Project of Yunnan ProvinceYunnan Fundamental Research ProjectsYunnan Fundamental Research ProjectsYunnan Major Research and Development PlanCentral guidance for Local ProjectsYunnan laboratory projectMajor R&D Project of Yunnan ProvinceMajor R&D Project of Yunnan Precious Metals Laboratory Co.,Ltd

202102AB080019-1202101AW070011202101BE070001-015202203ZA080001202307AA110003YPML-20220502157202302AB080021YPML-2023050205

2024

10.1007/s12598-023-02482-y

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(3)
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