Effects of Different Temperature Paths During Reciprocating Upsetting-Extrusion on Dynamic Recrystallization Refinement of VW93A Alloy

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2025-02-25 DOI:10.1007/s12540-025-01914-x

Xiaoxia Han, Renyuan Lu, Yunfang Liu, Qianning Liu, Zhimin Zhang, Jianmin Yu, Linlin Li

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Abstract

In this paper, the grain refinement mechanism of VW93A alloy under different temperature paths during reciprocating upsetting and extrusion processes were investigated, and elucidates the evolution mechanism of long-period stacking order Long-period stacked ordered (LPSO) phase with different shapes. It is found that with the increase of the cumulative strain, the alloy microstructure of constant temperature reciprocating (CTR) and decrease temperature reciprocating upsetting-extrusion (DTR) is significantly refined, and the refinement mechanisms are mainly CDRX (continuous dynamic recrystallization) and DDRX (discontinuous dynamic recrystallization). Under the combined action of non-basal slip and second-phase particle-stimulated nucleation (PSN), the dynamic recrystallization (DRX) degree of CTR-treated alloy was higher and the structure was more uniform. The early commencement and production of dislocation walls facilitated by LPSO phase kinking, as well as the occurrence of non-basal slip under these deformation conditions, are the primary causes of the CTR-treated alloy's quick refining. The more fragmented LPSO phase in the deformed alloy is conducive to the nucleation and microstructure homogenization of dynamic recrystallization. Furthermore, following three deformations, a high number of small needle-like phases precipitate, which effectively pins the recrystallized grains' grain borders and inhibits their growth.

Graphical Abstract

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往复镦挤不同温度路径对VW93A合金动态再结晶细化的影响

研究了往复镦粗和挤压过程中不同温度路径下VW93A合金的晶粒细化机理，阐明了不同形状长周期堆积有序相（LPSO）的演化机理。研究发现，随着累积应变的增大，恒温往复镦挤（CTR）和低温往复镦挤（DTR）合金的显微组织明显细化，细化机制主要为CDRX（连续动态再结晶）和DDRX（不连续动态再结晶）。在非基底滑移和第二相粒子激发形核（PSN）的共同作用下，cr处理合金的动态再结晶（DRX）程度更高，组织更均匀。在这种变形条件下，LPSO相扭结促进了位错壁的早期形成和产生，以及非基底滑移的发生，是cr处理合金快速细化的主要原因。变形合金中碎片化程度较高的LPSO相有利于动态再结晶的成核和组织均匀化。此外，经过三次变形后，大量的小针状相析出，有效地固定了再结晶晶粒的晶界，抑制了晶粒的生长。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.