Tensile Properties and Fracture Reliability of Melt-extracted Gd-rich Amorphous Wires

Abstract

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.

Magnetocaloric effect and microstructure of amorphous/nanocrystalline HoErFe melt-extracted microwires

“…To date, only one isobaric alloy with equal atomic proportions of three elements has been reported, whose strength and toughness properties far exceed those of most HEAs and MEAs [11]. This issue inspires us to reduce the elemental composition of the material system, while retaining the desirable properties of the material [14][15][16]. It is expected that a medium-entropy alloy with excellent comprehensive performance for cooling applications can be attained.…”

Characterization of hot forged P285NH steel by metallurgical investigation and reliability analysis

“…Engineers apply a set of tests and analysis to evaluate the mechanical properties of their components. It is important to determine the reliability of these experiments through test machine uncertainties, manufacturing instabilities, material properties or size effect on the failure probabilities by means of the statistical methods [13]. Some studies have dealt with the case of reliability approach through mechanical properties of materials [14][15][16].…”

In Situ SEM Torsion Test of Metallic Glass Microwires Based on Micro Robotic Manipulation

“…The reason for the rareness of torsion test of microwire was the great challenge involved in the experiment, such as the alignment between the specimen and the rotation axis, the detection of torsion angle, and the sensibility and calibration of torque meter. In this paper, we investigated the torsion fracture behavior of the La 50 Al 30 Ni 20 MG microwire under in situ SEM and compared the fracture surface with tensile loading test [ 24 – 26 ] based on a self-developed micro robotic mechanical testing system. After analyzing the pattern on the fracture surface, the fracture mechanism of the microwire under torsion loading was proposed.…”