Additively manufactured CoCrFeNiMn high-entropy alloy via pre-alloyed powder

Wang, Pan; Huang, Pengfei; Ng, Fern Lan; Sin, Wai Jack; Lu, S.L.; Nai, Mui Ling Sharon; Dong, Zhili; Wei, Jun

doi:10.1016/j.matdes.2018.107576

Cited by 142 publications

(61 citation statements)

References 54 publications

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“…Li et al 38 found that Mn undergoes segregation when equiatomic CoCrFeMnNi HEA is manufactured using SLM. According to Wang et al 41 , when equiatomic CoCrFeMnNi HEA was manufactured with pre-alloyed powder using electron beam melting (EBM), it was confirmed that Fe, Cr and Co elements segregate into the dendrite, whereas, Mn and Ni segregate into the interdendrite region. However, when the optimal process condition using SLM was deduced, no dendritic microstructure was formed, and it was possible to manufacture a random solid solution HEA with compositional homogeneity.…”

Section: Resultsmentioning

confidence: 99%

Superior Temperature-Dependent Mechanical Properties and Deformation Behavior of Equiatomic CoCrFeMnNi High-Entropy Alloy Additively Manufactured by Selective Laser Melting

Kim

Yang

Lee

2020

Sci Rep

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The microstructure, temperature-dependent mechanical properties and deformation behaviors of equiatomic CoCrFeMnNi high-entropy alloy (HEA) additively manufactured by selective laser melting (SLM) were investigated. SLM-built HEA had a face-centered cubic (FCC) single-phase random solid solution. In addition, SLM-built HEA was composed of epitaxial growth grains, dislocation network and nano-sized oxides. Room- and high-temperature compression tests confirmed that SLM-built HEA has outstanding mechanical properties in all temperature ranges compared to equiatomic CoCrFeMnNi HEAs reported up to the present. The excellent mechanical properties of SLM-built HEA were achieved with fine grains, high dislocation density and fine precipitates at low temperatures (25 °C to 600 °C), and by high dislocation density and fine precipitates at high temperatures (700 °C or higher). On the other hand, the deformation microstructure showed that slip and deformation twins are the main deformation mechanisms from 25 °C to 600 °C, and slip and partial recrystallization are the main deformation mechanisms above 700 °C. Based on the above findings, this study also discusses correlations among the microstructure, superior mechanical properties and deformation mechanisms of SLM-built equiatomic CoCrFeMnNi HEA.

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Section: Resultsmentioning

confidence: 99%

Superior Temperature-Dependent Mechanical Properties and Deformation Behavior of Equiatomic CoCrFeMnNi High-Entropy Alloy Additively Manufactured by Selective Laser Melting

Kim

Yang

Lee

2020

Sci Rep

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“…In terms of the materials, the most used HEA is the CoCrFeNiMn one. This is probably related to the fact that this alloy system is the most studied within the field of HEAs [22,25,34,[70][71][72]. For this reason, in this section of the paper (2.1.1), we first address the current status on fusion-welding of the CoCrFeNiMn HEA system, and the following one (2.1.2) focuses on the remaining materials that were already welded.…”

Section: Fusion-based Welding Of Heasmentioning

confidence: 99%

A Short Review on Welding and Joining of High Entropy Alloys

Lopes

Oliveira

2020

Metals

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High entropy alloys are one of the most exciting developments conceived in the materials science field in the last years. These novel advanced engineering alloys exhibit a unique set of properties, which include, among others, good mechanical performance under severe conditions in a wide temperature range and high microstructural stability over long time periods. Owing to the remarkable properties of these alloys, they can become expedite solutions for multiple structural and functional applications. Nevertheless, like any other key engineering alloy, their capacity to be welded, and thus become a permanent feature of a component or structure, is a fundamental issue that needs to be addressed to further expand these alloys’ potential applications. In fact, welding of high entropy alloys has attracted some interest recently. Therefore, it is important to compile the available knowledge on the current state of the art on this topic in order to establish a starting point for the further development of these alloys. In this article, an effort is made to acquire a comprehensive knowledge on the overall progress on welding of different high entropy alloy systems through a systematic review of both fusion-based and solid-state welding techniques. From the current literature review, it can be perceived that welding of high entropy alloys is currently gaining more interest. Several high entropy alloy systems have already been successfully welded. However, most research works focus on the well-known CoCrFeMnNi. For this specific system, both fusion and solid-state welding have been used, with no significant degradation of the joints’ mechanical properties. Among the different welding techniques already employed, laser welding is predominant, potentially due to the small size of its heat source. Overall, welding of high entropy alloys is still in its infancy, though good perspectives are foreseen for the use of welded joints based on these materials in structural applications.

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“…AM processes have distinguishing characteristics in high design flexibility, no additional cost for geometric complexity, fewer waste material and nonessential assemblage over conventional subtractive manufacturing processes (Gibson, Rosen, and Stucker 2015;Chua and Leong 2017;Yang et al 2019;Pham et al 2019;Li et al 2020). In addition, AM processes make it possible to fabricate complex parts and produce products with heterogeneous materials and customisable functionalities (Wang et al 2019a(Wang et al , 2019bJiang 2020;Wang et al 2021). Convinced by such characteristics and potential, some have anticipated that AM processes would bring revolutionary changes to the manufacturing industry (Gao et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Automatic determination of part build orientation for laser powder bed fusion

Qin

Shi

et al. 2020

Virtual and Physical Prototyping

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In this paper, an automatic determination method of part build orientation for laser powder bed fusion is presented. This method includes two steps. First, an existing facet clustering-based approach is applied to automatically generate the alternative orientations of a laser powder bed fusion part. Second, support volume, volumetric error, surface roughness, build time and build cost are considered. Their values in each alternative orientation are estimated by certain estimation models. The weights of these factors are determined via pairwise comparison. The weighted sum model is used to calculate a summary value of the factors in each alternative orientation. According to the calculated summary values, an optimal orientation to build the part is generated. To demonstrate the method, a set of part orientation cases are tested, and effectiveness analysis and efficiency and characteristic comparisons are reported. The demonstration results suggest that the proposed method can work for both regular and freeform surface models, produce stable and reasonable results and provide desired efficiency.

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Additively manufactured CoCrFeNiMn high-entropy alloy via pre-alloyed powder

Cited by 142 publications

References 54 publications

Superior Temperature-Dependent Mechanical Properties and Deformation Behavior of Equiatomic CoCrFeMnNi High-Entropy Alloy Additively Manufactured by Selective Laser Melting

Superior Temperature-Dependent Mechanical Properties and Deformation Behavior of Equiatomic CoCrFeMnNi High-Entropy Alloy Additively Manufactured by Selective Laser Melting

A Short Review on Welding and Joining of High Entropy Alloys

Automatic determination of part build orientation for laser powder bed fusion

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