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vol.18 suppl.1Superelasticity in Polycrystalline Ni-Mn-Ga-Fe Microwires Fabricated by Melt-extractionDomain Transformation and MI of Melt-extracted Co68.15Fe4.35Si12.25B13.25Nb1Cu1 Microwires by Cryogenic Joule Annealing índice de autoresíndice de assuntospesquisa de artigos
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Materials Research

versão impressa ISSN 1516-1439versão On-line ISSN 1980-5373

Resumo

SHEN, Hongxian et al. Tensile Properties and Fracture Reliability of Melt-extracted Gd-rich Amorphous Wires. Mat. Res. [online]. 2015, vol.18, suppl.1, pp.66-71.  Epub 17-Nov-2015. ISSN 1516-1439.  http://dx.doi.org/10.1590/1516-1439.325514.

Gd60Al20Co20 amorphous wires with smooth surfaces and circular cross-sections were fabricated by a melt-extraction technique. The mechanical properties of the extracted microwires were evaluated by tensile tests and their fracture reliability was estimated by using Lognormal and two- or three- parameter Weibull analysis, respectively. The microwires exhibit a tensile fracture strength ranging from ~788 to ~1196 MPa, with a mean value of 1008 MPa and a standard variance of 121 MPa. Lognormal method of statistical analysis presents that the average stress of microwires is ~1012 MPa. Weibull statistical analysis indicates that the two-parameter tensile Weibull modulus is 8.5 and the three-parameter Weibull modulus is 5.3 with a threshold value ~365 MPa for as-extracted amorphous microwires. Our results show that the extracted Gd-based wires possess excellent tensile properties and high fracture reliability, with a high potential for applications in and magnetic refrigeration.

Palavras-chave : melt-extraction; metallic glass microwires; tensile property; fracture reliability.

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