Dynamic mechanical properties and σ precipitates strengthening of a NiCrFeCoMo0.2 high-entropy alloy additively manufactured by selective laser melting

被引：14

作者：

Huang, Yiyu ^{[1
,2
]}

Li, Wenshu ^{[1
,2
]}

Liu, Ruoyu ^{[1
,2
]}

Chen, Haoyu ^{[1
,2
]}

Wu, Qi ^{[1
,2
]}

Wei, Shaohong ^{[1
,3
]}

Liu, Bin ^{[2
]}

Liaw, Peter K. ^{[4
]}

Wang, Bingfeng ^{[1
,2
]}

机构：

[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China

[2] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

[3] Chinese Acad Sci, Inst High Energy Phys IHEP, Dongguan Res Dept, Dongguan 523808, Peoples R China

[4] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2023年 / 968卷

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

Selective laser melt; High-entropy alloy; Mechanical properties; Precipitate; MICROSTRUCTURE; BEHAVIOR;

D O I：

10.1016/j.jallcom.2023.172244

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Dynamic mechanical properties of the selected laser melting (SLM)-NiCrFeCoMo0.2 high-entropy alloy (HEA) are further improved by controlling the molten pool structure and the generation of sigma-phase precipitation particles. In this study, a split Hopkinson pressure bar (SHPB) was used for testing the dynamical mechanical properties of the quenched SLM-NiCrFeCoMo0.2 HEA specimens. Microstructure and volume fraction of the sigma precipitates were characterized by X-ray diffractometry (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and the small angle neutron scattering (SANS) technique. After heating to 800 degrees C, holding for 8 h and water quenching, the molten pool boundary of the SLM-NiCrFeCoMo0.2 HEA disappear, and the ultimate compressive strength and the impact energy of specimens reach 1970 MPa and of 217.45 MJ.m(-3), respectively. Due to the segregation of Mo elements in the molten-pool boundary of the as-build SLM-NiCrFeCoMo0.2 HEA, more s precipitates tend to form at the residual molten pool boundary of the quenched SLM-NiCrFeCoMo0.2 HEA. The s precipitates play key role in strengthening of the SLM-NiCrFeCoMo0.2 HEA.

引用

页数：10

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