Ultrafine-grained porous titanium and porous titanium/magnesium composites fabricated by space holder-enabled severe plastic deformation

Yuanshen Qi; Karla G Contreras; Hyun-Do Jung; Hyoun-Ee Kim; Rimma Lapovok; Yuri Estrin

doi:10.1016/j.msec.2015.10.070

Ultrafine-grained porous titanium and porous titanium/magnesium composites fabricated by space holder-enabled severe plastic deformation

Mater Sci Eng C Mater Biol Appl. 2016 Feb:59:754-765. doi: 10.1016/j.msec.2015.10.070. Epub 2015 Oct 26.

Authors

Yuanshen Qi¹, Karla G Contreras², Hyun-Do Jung³, Hyoun-Ee Kim⁴, Rimma Lapovok⁵, Yuri Estrin⁶

Affiliations

¹ Centre for Advanced Hybrid Materials, Department of Materials Engineering, Monash University, Clayton, Victoria 3800, Australia. Electronic address: yuanshen.qi@monash.edu.
² Monash Institute of Medical Engineering, Faculty of Engineering, Monash University, Clayton, Victoria 3800, Australia.
³ Liquid Processing & Casting Technology R&D Group, Korea Institute of Industrial Technology, Incheon 406-840, Republic of Korea; Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Republic of Korea.
⁴ Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Republic of Korea; Advanced Institutes of Convergence Technology, Seoul National University, Gwanggyo, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-270, Republic of Korea.
⁵ Centre for Advanced Hybrid Materials, Department of Materials Engineering, Monash University, Clayton, Victoria 3800, Australia.
⁶ Centre for Advanced Hybrid Materials, Department of Materials Engineering, Monash University, Clayton, Victoria 3800, Australia; Laboratory of Hybrid Nanostructured Materials, NUST MISiS, Moscow 119490, Russia. Electronic address: yuri.estrin@monash.edu.

PMID: 26652430
DOI: 10.1016/j.msec.2015.10.070

Abstract

Compaction of powders by equal channel angular pressing (ECAP) using a novel space holder method was employed to fabricate metallic scaffolds with tuneable porosity. Porous Ti and Ti/Mg composites with 60% and 50% percolating porosity were fabricated using powder blends with two kinds of sacrificial space holders. The high compressive strength and good ductility of porous Ti and porous Ti/Mg obtained in this way are believed to be associated with the ultrafine grain structure of the pore walls. To understand this, a detailed electron microscopy investigation was employed to analyse the interface between Ti/Ti and Ti/Mg particles, the grain structures in Ti particles and the topography of pore surfaces. It was found that using the proposed compaction method, high quality bonding between particles was obtained. Comparing with other powder metallurgy methods to fabricate Ti with an open porous structure, where thermal energy supplied by a laser beam or high temperature sintering is essential, the ECAP process conducted at a relatively low temperature of 400°C was shown to produce unique properties.

Keywords: Equal channel angular pressing compaction; Microstructure; Porous Ti; Porous Ti/Mg composite; Space holder method.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Hot Temperature
Magnesium / chemistry*
Pressure
Titanium / chemistry*

Substances

Titanium
Magnesium