Investigation of mechanical properties and microstructure of Ti-15% Mo alloy produced by mechanical alloying and sintering with SPS (MA-SPS)

Abstract

The goal of this study was to investigate the mechanical properties and microstructure of Ti-15% Mo alloy fabricated using the mechanical alloying and spark plasma sintering (MA-SPS) method. Accordingly, Ti and Mo powders were milled for different times, including 5, 15, 25, 35, and 45 h, and the SPS technique for sintering under a pressure of 25 MPa at 1100°C was used. The X-ray diffraction (XRD) analysis, optical and electron microscopy (SEM), hardness measurements, and compression testing were used to study the phases formed, the morphology of powders, microstructure, and mechanical properties of the as-prepared samples, respectively. The results revealed that owing to increasing the mechanical milling time, the percentage of the beta phase formed was higher, and in addition, it influenced the microstructure and mechanical properties of the samples fabricated after the sintering process.

Assessing the mechanical properties of out-of-specification additive manufacturing Ti-6Al-4V powder recycled through field-assisted sintering technology (FAST)

“…15,16,18 Tensile strengths from sub-size test specimens have also been reported; for example, ∼350 MPa with ∼30% elongation for < 45 µm GA grade 1 CP-Ti and ∼600 MPa with ∼15% elongation for < 45 µm angular grade 3 CP-Ti, 19 978-1045 MPa with 6.3-18.2% elongation for < 45 µm GA Ti-6Al-4V, 20 1240 MPa with 19.5% elongation for 75-150 µm GA Ti-6Al-4V through manipulation of FAST load and temperature to create a 'bimorphic' microstructure, 21 844/893 MPa with 12/17% elongation for 53-106 µm GA Ti-6Al-4V either as-FAST or with subsequent heat treatment, 22 and 1183 MPa with 6% elongation for Ti-5Al-5V-5Mo-3Cr created from blended elemental 10-80 µm angular and spherical powders. 23 Several studies have also examined the potential to enhance mechanical properties of titanium alloys by performing extensive milling of the powders prior to FAST consolidation [24][25][26][27][28] ; although it was reported that the fatigue life of both un-milled and milled powders was 74% of the materials' tensile strength.…”

Investigation of mechanical and microstructure characteristics of Ti64-bagasse ash composite produced by the SPS process

“…Ti64 alloy is one of the most important titanium alloys of (a + β) type, which was founded in 1954 with the addition of 6% aluminium to stabilise the α-phase and 4% vanadium to stabilise the β-phase [8]. Owing to the high corrosion resistance, mechanical properties, and good biocompatibility of this alloy, it is not surprising that it is used for various medical applications [6,7,9,10]. Titanium and its alloys have high melting temperatures and it is difficult to inhibit their reaction with atmospheric gases such as oxygen and nitrogen in the liquid state [11].…”