Laser welding of precipitation strengthened Ni-rich NiTiHf high temperature shape memory alloys: Microstructure and mechanical properties
| Autor: | João Pedro Oliveira, L. Wood, N. Zhou, N. Schell, Othmane Benafan |
|---|---|
| Přispěvatelé: | DEMI - Departamento de Engenharia Mecânica e Industrial, UNIDEMI - Unidade de Investigação e Desenvolvimento em Engenharia Mecânica e Industrial |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
High temperature shape memory alloys
Materials science 02 engineering and technology Welding 010402 general chemistry 7. Clean energy 01 natural sciences law.invention ddc:690 Materials Science(all) law lcsh:TA401-492 General Materials Science Composite material Superelasticity Austenite Synchrotron radiation Precipitation (chemistry) Mechanical Engineering Laser beam welding Shape-memory alloy 021001 nanoscience & nanotechnology Microstructure 0104 chemical sciences Mechanics of Materials Martensite Pseudoelasticity Laser welding NiTiHf lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology Martensitic phase transformation |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP Materials & Design, Vol 162, Iss, Pp 229-234 (2019) Oliveira, J.P.; Schell, N.; Zhou, N.; Wood, L.; Benafan, O.: Laser welding of precipitation strengthened Ni-rich NiTiHf high temperature shape memory alloys: Microstructure and mechanical properties. In: Materials and Design. Vol. 162 (2019) 229-234. (DOI: /10.1016/j.matdes.2018.11.053) Materials and design 162, 229-234 (2019). doi:10.1016/j.matdes.2018.11.053 |
| ISSN: | 0261-3069 |
| Popis: | DESY via beamtime proposal I-20160912. NASA Aeronautics Research Mission Directorate (ARMD) Transformational Tools & Technologies (TTT). Sem PDF conforme despacho. High temperature shape memory alloys are currently attracting significant attention by the aerospace industry due to the potential use of shape memory and superelastic properties at temperatures above 100 °C. Virtually any advanced engineering material must, at some point, be joined either to itself, to create complex shaped structures, or to other materials to increase its potential applications. In this work, laser welding of a precipitation strengthened Ni-rich NiTiHf high temperature shape memory alloy is reported for the first time. Starting with a base material aged at 500 °C for 3 h and air cooled, defect-free joints with a conduction weld mode were obtained. Microstructural characterization, facilitated via microscopy and synchrotron X-ray diffraction, revealed that the fusion zone contained a single-phase martensitic structure at room temperature, compared to a mixture of martensite and H-phase precipitates in the base material. Isothermal loading in both the martensite (at 30 °C) and austenite (at 200 °C) phases revealed equivalent strength and near-perfect superelasticity in the welded and un-welded reference material. published |
| Databáze: | OpenAIRE |
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