新型双相Ni-W-Co-Mo中重合金的动态再结晶行为

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-06-13 DOI:10.1016/j.intermet.2025.108837

Wannian Wang , Zhanxing Chen , Tengfei Ma , Xinfang Zhang , Xiaohong Wang , Yajun Yin , Jianxin Zhou , Hongze Fang

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引用次数: 0

摘要

采用Gleeble-3800热变形仪研究了新型双相Ni-42W-10Co-10Mo （wt.%）中重合金（MHA）在1150 ~ 1300℃范围内的热变形行为，应变速率为0.001 ~ 1 s−1。铸态合金表现为面心立方基体和μ相分布于枝晶间的亚共晶组织。热变形激活能为855.6 kJ/mol，主要是由于变形过程中二次μ相的析出。μ相合金对动态再结晶（DRX）有积极的影响，粒子激发形核（PSN）为DRX提供了大量的形核位点，而μ相的钉住作用抑制了晶粒的生长，导致了细晶组织的形成。此外，在合金中观察到应变诱导的边界迁移（SIBM）成核机制。PSN和SIBM的共同作用促进了精细动态再结晶晶粒的形成。根据热加工图和显微组织演变，确定Ni-42W-10Co-10Mo MHA的热变形窗口为变形温度为1200℃，应变速率为0.01 ~ 0.1 s−1。

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Dynamic recrystallization behavior of a novel duplex Ni-W-Co-Mo medium-heavy alloy

The hot deformation behavior of a novel duplex Ni-42W-10Co-10Mo (wt.%) medium-heavy alloy (MHA) was studied using Gleeble-3800 within temperature ranging from 1150 °C to 1300 °C under strain rates of 0.001–1 s⁻¹. The as-cast alloy exhibited a hypoeutectic microstructure, characterized by a face-centered cubic matrix and μ phase distributed in the inter-dendritic regions. The hot deformation activation energy was determined to be 855.6 kJ/mol, primarily due to the precipitation of secondary μ phases during deformation. The μ phase alloys showed a positive effect on dynamic recrystallization (DRX), Particle-stimulated nucleation (PSN) provided numerous nucleation sites for DRX, while the pinning effect of the μ phase inhibited grain growth, leading to formation of a fine-grained microstructure. Furthermore, a strain-induced boundary migration (SIBM) nucleation mechanism was observed in the alloy. The combined effects of PSN and SIBM facilitated formation of refined dynamic recrystallized grains. The hot deformation window of Ni-42W-10Co-10Mo MHA was determined as deformation temperature of 1200 °C under strain rates of 0.01–0.1 s⁻¹ based on hot processing map and microstructural evolution.

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.