On a Testing Methodology for the Mechanical Property Assessment of a New Low-Cost Titanium Alloy Derived from Synthetic Rutile

Abstract

Mechanical property data of a low-cost titanium alloy derived directly from synthetic rutile is reported. A small-scale testing approach comprising consolidation via field-assisted sintering technology, followed by axisymmetric compression testing, has been designed to yield mechanical property data from small quantities of titanium alloy powder. To validate this approach and provide a benchmark, Ti-6Al-4V powder has been processed using the same methodology and compared with material property data generated from thermo-physical simulation software. Compressive yield strength and strain to failure of the synthetic rutile-derived titanium alloy were revealed to be similar to that of Ti-6Al-4V.

Direct electrochemical production of pseudo-binary Ti–Fe alloys from mixtures of synthetic rutile and iron(III) oxide

“…Ti alloy powder derived from SR reduction in the FFC-Cambridge process has previously been consolidated using FAST, generating a homogeneous a ? b microstructure with compressive mechanical properties comparable to Ti-6Al-4V processed under the same conditions [29].…”

Challenges in Qualifying Additive Manufacturing for Turbine Components: A Review

“…Another important factor to be considered is the necessity to evaluate mechanical properties at small length scales which are comparable to the geometry of the part with comparable microstructures and phase equilibria. There are limited reports and practically few standards for testing at small length scales [88,[157][158][159][160][161][162][163]. Figure 8a shows an example of micro-tensile specimen geometry vs regular tensile (ASTM E8) [163] which is particularly important to assess the mechanical behaviour related to heterogeneity in microstructure along a build, as shown in Fig.…”

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

“…14 Despite FAST furnaces becoming more common in research institutes and industry, the reporting of mechanical properties from FAST-processed materials is often limited due to the typically small samples produced. 10 Mechanical properties of FAST-processed titanium alloys have been obtained by compression testing [15][16][17] and inferred from hardness testing. 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.…”