NiPt15合金热变形行为及微观组织演变规律

doi:10.11896/cldb.20030090

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Abstract In this paper, Gleeble-3500 thermal simulator is used to study the high-temperature thermal deformation process of NiPt15 alloy. The defor-mation temperature of NiPt15 alloy is set to 950—1 150 ℃ and the deformation rate is 0.01 — 3 s^-1. A hyperbolic sinusoidal Arrhenius constitutive model is established, and the dependence of the parameters on the strain is fitted, by analyzing the true stress-strain curve under different conditions during thermal deformation. Through the characterization of hot deformed microstructure and microhardness, the difference of hot deformation microstructure in each region of the sample was studied, and the effects of temperature, deformation rate, lnZ on dynamic recrystallization and Vickers hardness were analyzed. The results show that the true stress-strain curve of NiPt15 alloy includes three different changing trends, and the corresponding critical temperature value of the trend change at each deformation rate is different; the strain activation energy is not more than 476.85 kJ/mol. Increasing the temperature and reducing the deformation rate can increase the recrystallization ratio to complete dynamic recrystallization. The nucleation mechanism of NiPt15 alloy is discontinuous dynamic recrystallization, which mainly uses grain boundary bowing and repeated twinning to provide nucleation for recrystallized grains position. When lnZ is less than 38.89, the grain size has a negative correlation with lnZ. When lnZ is greater than 38.89, the relationship between the grain size and lnZ is not obvious; the hardness and lnZ have a positive correlation under the experimental conditions.

Key words： NiPt15 alloy hot deformation behavior dynamic recrystallization nucleation mechanism

Published: 04 June 2021

CLC number:

TG146.3⁺3

Fund:National Key Research and Development Project (2017YFB0305503), the General Project of Applied Basic Research in Yunnan Province (2016FB086), the Yunnan Innovation Team Project (2019HC024), the 18th Batch of Technological Innovation Talents in Yunnan Province (13020176), the Kunming Rare and Precious Metal Sputtering Target Technology Innovation Team (13020169), the Technology Development Research Project of Scientific Research Institute of Yunnan Provincial Department of Science and Technology (2018DC004).

About author:: Changchang Yin received his B.E. degrees in June 2015 from Southwest Jiaotong University. He is studying at Kunming Institute of Precious Metals and conducting research under the guidance of Teacher Zhilong Tan, focusing on the research of precious metal thermal simulation.
Zhilong Tan is a senior engineer and postgraduate tutor at the Kunming Institute of Precious Metals. In July 2007, he graduated from the School of Materials of Nanchang Aviation University. In July 2010, he obtained a master's degree in materials science from the Kunming Institute of Precious Metals. After graduation, he stayed at the Institute. In 2018, he was selected as the 18th batch of technical innovation talents in Yunnan Province. He mainly engaged in the research work of rare metal functional materials. In recent years, he has published more than 20 academic papers in the field of rare metal alloy materials and has been granted 8 invention patents.

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	YIN Changchang
	YU Dengde
	CHEN Jialin
	WEN Ming
	GUAN Weiming
	TAN Zhilong

Cite this article:

YIN Changchang,YU Dengde,CHEN Jialin, et al. Hot Deformation Behavior and Microstructure Evolution of NiPt15 Alloy[J]. Materials Reports, 2021, 35(10): 10120-10126.

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http://www.mater-rep.com/EN/10.11896/cldb.20030090 OR http://www.mater-rep.com/EN/Y2021/V35/I10/10120

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