在低温下，通过增强的TRIP效应，添加Si的亚稳态高熵合金具有极好的强度-延性协同作用

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2025-03-01 DOI:10.1016/S1003-6326(24)66720-8

Zhan-jiang LI , Yi-xi HOU , Li CHEN , Qing-xin CHEN , Jun-feng CHEN , Fa CHANG , Pin-qiang DAI , Qun-hua TANG

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引用次数: 0

摘要

研究了选择性激光熔融法制备的（Fe50Mn30Co10Cr10）100−xSix (x=0 （Si0), 2 (Si2)）亚稳态HEAs在低温下的拉伸行为。结果表明，Si的加入导致Si2 HEAs的晶格畸变和层错能的降低，特别是在77 K时，这显著提高了Si2 HEAs的相变诱导塑性（TRIP）。Si2 HEAs的屈服强度为505.2 MPa，抗拉强度为1364.1 MPa，塑性为19%，分别比Si0合金高43%、53%和58%。TRIP是除位错滑移外的主要变形方式，在强化中起关键作用。在变形过程中，增强和连续持续的TRIP保持动态应变分布。超高应变硬化大大提高了材料的强度和延展性。

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Superb strength−ductility synergy in Si added metastable high-entropy alloys at cryogenic temperature via reinforced TRIP effect

The tensile behavior of (Fe₅₀Mn₃₀Co₁₀Cr₁₀)_100−xSi_x (x=0 (Si0), 2 (Si2)) metastable HEAs prepared by selective laser melting was studied at cryogenic temperatures. The results demonstrate that the addition of Si leads to lattice distortion and a decrease in stacking fault energy, especially at 77 K, which significantly promotes transformation- induced plasticity (TRIP) in Si2 HEAs. The yield strength, tensile strength, and ductility of Si2 HEAs are 505.2 MPa, 1364.1 MPa, and 19%, which are 43%, 53% and 58% higher than those of Si0 alloy, respectively. TRIP is the main deformation mode, in addition to dislocation slip, and plays a key role in strengthening. The reinforced and continuously sustained TRIP maintains a dynamic strain distribution during deformation. Ultrahigh strain hardening greatly enhances the strength and ductility.

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.