Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Evolution of the Microstructure and Mechanical Properties of a Ti35Nb2Sn Alloy Post-Processed by Hot Isostatic Pressing for Biomedical Applications

Version 1 : Received: 17 April 2021 / Approved: 19 April 2021 / Online: 19 April 2021 (17:16:20 CEST)

How to cite: Femenía, J.L.; Escuder, A.V.; Borrás, V.A. Evolution of the Microstructure and Mechanical Properties of a Ti35Nb2Sn Alloy Post-Processed by Hot Isostatic Pressing for Biomedical Applications. Preprints 2021, 2021040513 (doi: 10.20944/preprints202104.0513.v1). Femenía, J.L.; Escuder, A.V.; Borrás, V.A. Evolution of the Microstructure and Mechanical Properties of a Ti35Nb2Sn Alloy Post-Processed by Hot Isostatic Pressing for Biomedical Applications. Preprints 2021, 2021040513 (doi: 10.20944/preprints202104.0513.v1).

Abstract

The influence of the hot isostatic pressing (HIP) post-processing step on structural and phase changes, porosity healing and mechanical strength in a powder metallurgy Ti35Nb2Sn alloy was studied. Powders were pressed at room temperature at 750 MPa, and then sintered at 1,350°C in a vacuum for 3 h. The standard HIP process at 1,200°C and 150 MPa for 3 h was performed to study its effect on a Ti35Nb2Sn powder metallurgy alloy. The influence of the HIP process and cold rate on density, microstructure, the quantity of interstitial elements, mechanical strength and Young's modulus was investigated. HIP post-processing for 2 h at 1,200°C and 150 MPa led to greater porosity reduction and a marked retention of the β phase at room temperature. The slow cooling rate during the HIP process affected phase stability, with a large amount of α”-phase precipitate, which decreased the titanium alloy’s yield strength.

Subject Areas

Hot isostatic pressing; β-Type titanium alloy; biomaterial; phase transformation; powder metallurgy

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