Excellent superelasticity in a Co-Ni-Ga high-temperature shape memory alloy processed by directed energy deposition

Materials Research Letters

N. Sommer¹  T. Niendorf¹  S. Böhm¹  G. Mienert¹  C. Lauhoff¹  P. Krooß¹  M. Vollmer¹ 

[1] University of Kassel;

关键词: high-temperature shape memory alloys;    additive manufacturing;    laser melting;    pseudoelasticity;    direct microstructure design;   

DOI  :  10.1080/21663831.2020.1756495

来源: DOAJ

【 摘 要 】

A Co-Ni-Ga high-temperature shape memory alloy has been additively manufactured by directed energy deposition. Due to the highly anisotropic microstructure, i.e. columnar grains featuring a strong near-⟨001⟩ texture in build direction, the as-built material is characterized by a very low degree of constraints and, thus, shows excellent superelasticity without conducting a post-process heat treatment. As characterized by in situ deformation testing and post-mortem microstructural analysis, additive manufacturing employing directed energy deposition seems to be highly promising for processing of shape memory alloys, which often suffer difficult workability.

【 授权许可】

Unknown