A Si-containing FeCoCrNi high-entropy alloy with high strength and ductility synthesized in situ via selective laser melting

Lin, DanyangTianjin Univ, Sch Mat Sci & Engn, Tianjin 300050, Peoples R China.;Tianjin Key Lab Adv Joining Technol, Tianjin 300050, Peoples R China. (author)

QC 20201028
To widen the applications of new materials in additive manufacturing (AM), the traditional method of printing using pre-alloyed powders should be improved because the pre-alloying process is expensive and makes it difficult to adjust the composition of new materials. This study investigates the synthesis of a FeCoCrNi high-entropy alloy (HEA) containing 1.5 at.% Si in situ using selective laser melting (SLM). A remelting strategy and process optimization based on polynomial regression modeling allowed for the printing of almost fully dense (99.78 %) samples. The samples comprised columnar grains, each containing numerous subgrains of a single-phase face-centered cubic solid solution. No precipitation or segregation were observed. The room temperature tensile properties of the samples were excellent, with yields and tensile strengths reaching 701 +/- 14 and 907 +/- 25 MPa, respectively, and an elongation at fracture of 30.8 +/- 2%. These properties were attributed to solid solution strengthening and novel dislocation loop strengthening mechanism. These findings demonstrate that HEAs with a high relative density and good mechanical properties can be directly synthesized by SLM using inexpensive pure metal powders, thereby extending the application potential of AM to manufacture new materials.

Xu, LianyongTianjin Univ, Sch Mat Sci & Engn, Tianjin 300050, Peoples R China.;Tianjin Key Lab Adv Joining Technol, Tianjin 300050, Peoples R China.;Tianjin Univ, State Key Lab Engines, Tianjin 300050, Peoples R China. (author)
Li, XiaojieKTH,Egenskaper(Swepub:kth)u1nxbc26 (author)
Jing, HongyangTianjin Univ, Sch Mat Sci & Engn, Tianjin 300050, Peoples R China.;Tianjin Key Lab Adv Joining Technol, Tianjin 300050, Peoples R China. (author)
Qin, GangKTH,Materialvetenskap(Swepub:kth)u1rr2rpa (author)
Pang, HongningTianjin Univ, Sch Mat Sci & Engn, Tianjin 300050, Peoples R China.;Tianjin Key Lab Adv Joining Technol, Tianjin 300050, Peoples R China. (author)
Minami, FumiyoshiOsaka Univ, Joining & Welding Res Inst, Osaka 5650871, Japan. (author)
Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300050, Peoples R China.;Tianjin Key Lab Adv Joining Technol, Tianjin 300050, Peoples R China.Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300050, Peoples R China.;Tianjin Key Lab Adv Joining Technol, Tianjin 300050, Peoples R China.;Tianjin Univ, State Key Lab Engines, Tianjin 300050, Peoples R China. (creator_code:org_t)

By the author/editor: Lin, Danyang; Xu, Lianyong; Li, Xiaojie; Jing, Hongyang; Qin, Gang; Pang, Hongning; show more...; Minami, Fumiyosh ...; show less...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Metallurgy and M ...

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