变形温度对热挤压态纯铜织构演化的影响

李龙豪; 刘皓岚; 胡浩; 李习耀; 王江伟; 宋克兴

doi:10.3969/j.issn.1674-6457.2026.09.016

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精密成形工程 ›› 2026, Vol. 18 ›› Issue (9) : 159-167. DOI: 10.3969/j.issn.1674-6457.2026.09.016

铜合金成形

变形温度对热挤压态纯铜织构演化的影响

李龙豪^1,2, 刘皓岚^1,*, 胡浩², 李习耀¹, 王江伟¹, 宋克兴¹

作者信息 +

Effect of Deformation Temperature on Texture Evolution in Hot-extruded Copper

LI Longhao^1,2, LIU Haolan^1,*, HU Hao², LI Xiyao¹, WANG Jiangwei¹, SONG Kexing¹

Author information +

文章历史 +

摘要

目的系统分析变形过程中温度对热挤压态高纯铜织构演化及宏观力学性能的影响机制,为理解挤压态纯铜在力-热耦合环境下的织构演化及性能调控提供了新见解。方法基于原位背散射电子衍射（In-situ EBSD）技术,对热挤压态纯铜分别进行室温和高温原位拉伸实验,以关联微观组织演变与宏观力学行为。结果温度显著影响织构演化路径,尤其在6%~15%塑性应变区间内差异明显。室温变形时,晶粒倾向于向软取向转动,致使<100>（//LD）软织构含量显著升高,从而表现出相对较低的屈服强度与抗拉强度。相比之下,在高温条件下,晶粒向<100>软织构的转变受到抑制,<111>和<112>（//LD）硬织构比例显著上升,引入额外加工硬化效应,使极限抗拉强度提升至79.1 MPa,同时塑性进一步改善。结论高温改变了潜在的位错动力学行为,进而影响了晶粒旋转路径,促使<111>和<112>硬织构形成,从而提升了材料强度;此外,高温下动态回复过程与小角度晶界、几何必需位错密度降低的协同作用,有效缓解了局部应力集中,提升了材料的塑性变形能力。

Abstract

The work aims to systematically analyze the mechanisms by which temperature influences texture evolution and macroscopic mechanical properties of hot-extruded high-purity copper during deformation, so as to provide new insights for understanding texture evolution and property optimization under thermo-mechanical coupling environments. In-situ tensile experiments were conducted on hot-extruded pure copper at both room temperature and elevated temperature using in-situ electron backscatter diffraction (EBSD) to correlate microstructural evolution with the macroscopic mechanical behavior. Temperature significantly influenced the texture evolution pathway, with a distinct divergence observed particularly within the 6%-15% plastic strain interval. During room temperature deformation, grains tend to rotated towards soft orientations, resulting in a significant increase in the fraction of <100> soft texture (//LD) and consequently exhibiting relatively lower yield and tensile strengths. In contrast, elevated temperature conditions suppressed the transition towards the <100> soft texture and instead promoted a significant increase in the proportion of <111> and <112> hard textures. This accumulation contributed to an extra work hardening, enhancing the ultimate tensile strength by 79.1 MPa while concurrently increasing ductility. It is concluded that high temperature alters the underlying dislocation dynamics, thereby modifying grain rotation paths to favor the formation of <111> and <112> hard textures, which enhances material strength. Furthermore, the synergistic effect of dynamic recovery and the reduction in the densities of low-angle grain boundaries (LAGBs) and geometrically necessary dislocations (GNDs) effectively weaken the local stress concentrations, thereby enhancing the plasticity.

导出引用

李龙豪, 刘皓岚, 胡浩, 李习耀, 王江伟, 宋克兴. 变形温度对热挤压态纯铜织构演化的影响[J]. 精密成形工程. 2026, 18(9): 159-167 https://doi.org/10.3969/j.issn.1674-6457.2026.09.016

LI Longhao, LIU Haolan, HU Hao, LI Xiyao, WANG Jiangwei, SONG Kexing. Effect of Deformation Temperature on Texture Evolution in Hot-extruded Copper[J]. Journal of Netshape Forming Engineering. 2026, 18(9): 159-167 https://doi.org/10.3969/j.issn.1674-6457.2026.09.016

中图分类号： TG146.11

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