Effect of Network Structure Morphology on Fatigue Crack Propagation in Sintered Compact Composed of High-Entropy Alloy CrMnFeCoNi and 304SS

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2024-12-19 DOI:10.1111/ffe.14546

Arisa Ito, Keisuke Fujita, Hiroshi Fujiwara, Shoichi Kikuchi

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引用次数: 0

Abstract

In this study, high-entropy alloy (HEA; CrMnFeCoNi) and austenitic stainless steel (SS; AISI304L) powders were consolidated to fabricate sintered compacts having a network structure composed of a coarse-grained SS structure surrounded by an interconnected fine-grained HEA structure. A small-particle-size HEA powder and large-particle-size SS powder were mixed at various volume ratios and then consolidated by spark plasma sintering. The threshold stress intensity factor range, ΔK_th, for the sintered compacts with a HEA network structure did not depend on the volume fractions of HEA and SS, whereas ΔK_th for the sintered compacts with the opposite SS network structure tended to decrease with increasing HEA content. The effective threshold stress intensity factor range, ΔK_eff,th, for the HEA network structure was higher than that for the opposite SS network series because fatigue cracks preferentially propagated through the coarse-grained SS structure with a high ΔK_eff,th in the HEA network structure.

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高熵合金CrMnFeCoNi和304SS烧结致密体中网状组织形态对疲劳裂纹扩展的影响

本研究中，高熵合金(HEA；crmnnfeconi)和奥氏体不锈钢(SS；将AISI304L)粉末固结制备成具有网络结构的烧结压块，该网络结构由粗晶SS结构由互连的细晶HEA结构包围组成。将小颗粒HEA粉末和大颗粒SS粉末按不同体积比混合，然后用火花等离子烧结进行固结。具有HEA网络结构的烧结压块的阈值应力强度因子范围ΔKth与HEA和SS的体积分数无关，而具有相反SS网络结构的烧结压块的阈值应力强度因子ΔKth随HEA含量的增加而减小。HEA网络结构的有效阈值应力强度因子范围ΔKeff，th高于相反的SS网络系列，这是因为在HEA网络结构中，疲劳裂纹优先通过具有高ΔKeff，th的粗晶SS结构扩展。

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来源期刊

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.