最大限度地提高沉淀硬化效果,使粗晶Mg-13Gd锻造合金具有超高强度

IF 15.8 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Magnesium and Alloys Pub Date : 2024-10-01 DOI:10.1016/j.jma.2023.04.003
Dongdong Zhang , Hucheng Pan , Zhihao Zeng , Weineng Tang , Jingren Li , Hongbo Xie , Rongguang Li , Yuping Ren , Gaowu Qin
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引用次数: 0

摘要

在这项工作中,报告了一种通过利用再结晶质地硬化和最大化沉淀强化实现粗晶粒镁钆二元合金超高强度的新策略。高温锻造可抑制动态沉淀,使镁基体中的钆原子达到超饱和状态。这有利于形成具有较强质地的完全再结晶晶粒,并在随后的时效过程中产生极高的沉淀硬化。因此,锻造的 Mg-13Gd 样品表现出了∼430 兆帕的超常拉伸屈服强度(TYS),其中时效引起的 TYS 增量超过了∼210 兆帕,是迄今为止沉淀硬化镁群落的最高记录。这些结果为制造工业应用的大截面高强度镁部件提供了重要的理论指导。
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Maximizing precipitation hardening effect enables ultrahigh strength in a coarse-grained Mg-13Gd forging alloy
In this work, a new strategy for achieving ultrahigh strength in the coarse-grained Mg-Gd binary alloy via utilizing recrystallization texture hardening and maximizing precipitation strengthening has been reported. Forging at a much high temperature suppresses dynamic precipitation, enabling the super-saturation of Gd atoms in Mg matrix. This facilitates the formation of fully recrystallized grains with strong texture and induces an exceptionally high precipitation hardening in the following ageing. Therefore, the forged Mg-13Gd sample exhibited extraordinary tensile yield strength (TYS) of ∼430 MPa, in which ageing-induced TYS increment exceeds ∼210 MPa, as the highest record so far in precipitation-hardened Mg communities. These results provide important theoretical guidance for fabricating the large section and high-strength Mg components for industrial applications.
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来源期刊
Journal of Magnesium and Alloys
Journal of Magnesium and Alloys Engineering-Mechanics of Materials
CiteScore
20.20
自引率
14.80%
发文量
52
审稿时长
59 days
期刊介绍: The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.
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