Cu-Cr-Zr-Nd合金的动态再结晶行为及加工图

Dynamic recrystallization behavior and processing map of the Cu-Cr-Zr-Nd alloy.

作者信息

Zhang Yi, Sun Huili, Volinsky Alex A, Tian Baohong, Song Kexing, Chai Zhe, Liu Ping, Liu Yong

机构信息

College of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, 471003 China ; Department of Mechanical Engineering, University of South Florida, Tampa, FL 33620 USA ; Collaborative Innovation Center of Nonferrous Metals, Luoyang, 471003 Henan Province China.

College of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, 471003 China ; Collaborative Innovation Center of Nonferrous Metals, Luoyang, 471003 Henan Province China.

出版信息

Springerplus. 2016 May 20;5(1):666. doi: 10.1186/s40064-016-2317-z. eCollection 2016.

DOI:10.1186/s40064-016-2317-z

PMID:27347462

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4899349/

Abstract

Hot deformation behavior of the Cu-Cr-Zr-Nd alloy was studied by hot compressive tests in the temperature range of 650-950 °C and the strain rate range of 0.001-10 s(-1) using Gleeble-1500D thermo-mechanical simulator. The results showed that the flow stress is strongly dependent on the deformation temperature and the strain rate. With the increase of temperature or the decrease of strain rate, the flow stress significantly decreases. Hot activation energy of the alloy is about 404.84 kJ/mol and the constitutive equation of the alloy based on the hyperbolic-sine equation was established. Based on the dynamic material model, the processing map was established to optimize the deformation parameters. The optimal processing parameters for the Cu-Cr-Zr-Nd alloy hot working are in the temperature range of 900-950 °C and strain rate range of 0.1-1 s(-1). A full dynamic recrystallization structure with fine and homogeneous grain size can be obtained at optimal processing conditions. The microstructure of specimens deformed at different conditions was analyzed and connected with the processing map. The surface fracture was observed to identify instability conditions.

摘要

采用Gleeble-1500D热机械模拟器，在650-950℃温度范围和0.001-10 s(-1)应变速率范围内，通过热压缩试验研究了Cu-Cr-Zr-Nd合金的热变形行为。结果表明，流变应力强烈依赖于变形温度和应变速率。随着温度升高或应变速率降低，流变应力显著降低。该合金的热激活能约为404.84 kJ/mol，并基于双曲正弦方程建立了合金的本构方程。基于动态材料模型，建立了加工图以优化变形参数。Cu-Cr-Zr-Nd合金热加工的最佳工艺参数为温度范围900-950℃，应变速率范围0.1-1 s(-1)。在最佳加工条件下可获得具有细小均匀晶粒尺寸的完全动态再结晶组织。分析了不同条件下变形试样的微观组织，并与加工图相关联。观察表面断裂以确定失稳条件。