Mechanical Properties of an Fe‐Based SAM2×5‐630 Metallic Glass Matrix Composite with Tungsten Particle Additions

Abstract

We present the role of tungsten additions on the mechanical properties of a Fe-based structural amorphous metal (SAM2Â5-630) containing crystalline tungsten. Matrix cracking by microindentation is inhibited by the addition of tungsten and indicates that tungsten improves the fracture toughness. Response surfaces from nanoindentation arrays indicate that the hardness and modulus of the matrix phase are increased by tungsten additions. Bulk composites with 30 vol% tungsten subjected to 4-point flexure exhibited brittle fracture behavior and the characteristic strength and Weibull modulus were 165 and 8.7 MPa, respectively. The addition of tungsten did not cause devitrification of the matrix phase.

Design of Fe-Based Bulk Metallic Glasses with Improved Wear Resistance

“…In support of the validity of the fracture toughness measurements, we note that perfect corner cracks were successfully produced around the indentations obtained under a high applied load of 200 N (not shown here). The K c values obtained here for the developed BMGs are slightly greater than those obtained for other amorphous steels reported in the literature, e.g., 1.9–2.1 MPa m 1/2 for Fe 47– x Cr 20 Mo 10 W x C 15 B 6 Y 2 BMG, 2.2 MPa m 1/2 for Fe 41 Co 7 Cr 15 Mo 14 Er 2 C 15 B 6 BMG, 3.2–3.8 MPa m 1/2 for Fe 50– x Cr 15 Mo 14 C 15 B 6 Er x BMG, , and 4.9 MPa m 1/2 for Fe 49.7 Cr 17.7 Mn 1.9 Mo 7.4 W 1.6 B 15.2 C 3.8 Si 2.4 BMG …”

A method to quantify crystallinity in amorphous metal alloys: A differential scanning calorimetry study

“…Amorphous SAM2×5 with a chemical composition of Fe 49.7 Cr 17.7 Mn 1.9 Mo 7.4 W 1.6 B 15.2 C 3.8 Si 2.4 was used as a starting material [54][55][56][57][58]. To fully crystallize the amorphous SAM powder, a heat treatment to a temperature of 1323 K was implemented using a heating rate of 30 K/min in a Lindberg 59744-A tube furnace.…”

“…(b) The isostep method consists of short dynamic stages along the whole temperature range with isothermal stages before and after each heating segment. (c) The area method consists of consecutive isothermal segments with no heating stages in between [54].…”

Latest Advances in Manufacturing and Machine Learning of Bulk Metallic Glasses

“…The technique is predominantly used to obtain disks of diameters between 1 and %5 cm (can be larger for systems that can achieve higher loads and currents) and a few millimeters in thickness. [138,139] Samples would then need to be machined to obtain other shapes.…”