Use of laser powder bed fusion (LPBF) additive manufacturing (AM) in structural applications requires development of a) damage-tolerant alloys (alloys that exhibit high strength and ductility despite the presence of pores and/or microcracks), and b) corrosion resistant alloys. High entropy alloys (HEAs) offer abundant alloy design space that can be used to tune deformation mechanisms and address both these challenges effectively. In line with that, transformation induced plasticity (TRIP) assisted Fe_38.5Mn₂₀Co₂₀Cr₁₅Si₅Cu_1.5 HEA (Cu-HEA) was printed with LPBF-AM. Despite the presence of 1.5 vol. % of microcracks and pores, as-built Cu-HEA exhibits tensile strength of ∼1235 MPa (highest among as-built HEAs) and ductility of ∼17.2 %, thus displaying damage-tolerant behavior. Additionally, as-built Cu-HEA exhibits a steeper polarization slope as compared to SS 17-4 PH and as-cast Cu-HEA, thus exhibiting higher passivation tendency. These findings demonstrate an effective strategy for developing damage-tolerant anticorrosive materials for LPBF-AM.

在结构应用中使用激光粉末床熔合（LPBF）增材制造（AM）需要开发a）耐损伤合金（尽管存在孔和/或微裂纹，但合金仍具有高强度和延展性），以及b）耐腐蚀合金。高熵合金（HEA）提供了丰富的合金设计空间，可用于调整变形机制并有效应对这两个挑战。与此相符，相变诱导塑性（TRIP）辅助了Fe _38.5 Mn ₂₀ Co ₂₀ Cr ₁₅ Si ₅ Cu _1.5用LPBF-AM印刷HEA（Cu-HEA）。尽管有1.5卷。％的微裂纹和孔，Cu-HEA预制件表现出的拉伸强度约为1235 MPa（在预制HEA中最高），延展性约为17.2％，因此表现出耐损伤性能。另外，与SS 17-4 PH和铸态Cu-HEA相比，建成的Cu-HEA表现出更陡的极化斜率，因此表现出更高的钝化趋势。这些发现证明了开发用于LPBF-AM的耐损伤防腐材料的有效策略。