Instrumented ultramicrohardness testing on NiTi alloys produced by selective laser melting
Danilo Abílio Corrêa Gonçalves; Naiara Vieira Le Senéchal; Fábio Silva de Oliveira; Rafael Ramos; Rodolfo da Silva Teixeira; Paulo Paiva Oliveira Leite Dyer; Getúlio de Vasconcelos; Andersan dos Santos Paula
Abstract
Nickel-titanium (NiTi) alloys, known for their shape memory effect and superelasticity, are distinguished by their shape recovery capabilities and corrosion resistance. In recent years, additive manufacturing (AM), especially selective laser melting (SLM), has gained prominence in the production of complex NiTi structures. This study employs instrumented ultramicrohardness testing to characterize the mechanical properties of these alloys, including Vickers hardness (HV), elastoplastic Vickers dynamic hardness (DHV-1), plastic Vickers dynamic hardness (DHV-2), and indentation modulus (Eit). The tests were conducted on NiTi samples produced by SLM, with a laser remelting procedure applied. The results indicate a decreasing trend in HV, DHV-1, and DHV-2 values with increasing energy density in SLM fabrication, suggesting greater formation of matrix phases (B2, B19’, and R) and a lower percentage of Nix Tiy intermetallic precipitates
Keywords
Referências
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Submetido em:
04/10/2024
Aceito em:
07/01/2025
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