Interface of a Al6061/Ti Composite Prepared by Field Assisted Sintering Technique

Jiří Kozlík,Tomáš Chráska,Josef Stráský,Miloš Janeček,Jozef Veselý

doi:10.3390/met11010073

Abstract

Architectured heterogeneous metallic composites consist of two dissimilar materials with a particular focus on spatial arrangement of constituents. This experimental study describes the application of Field Assisted Sintering Technique (FAST) for manufacturing of composite materials by sintering of a bulk reinforcement with a powder metal. Simple structure made of Ti wire (Ti Grade 2) was sintered with Al6061 alloy powder at 560 °C for 10 min. Successful material bonding and evolution of diffusion layer was thoroughly studied by scanning and transmission electron microscopy. Diffusion layer and adjacent precipitates are described as ternary Ti-Al-Si τ1 and τ2 phases. Si, as an alloying element in the Al6061 alloy, significantly affects the formation of the diffusion layer at the material interface due to its high inter-diffusion coefficient in both Al and Ti. Detailed TEM analysis also showed a modulated τ1/τ2 structure resembling a long-period stacking order (LPSO) phase, which has not been previously reported in the Ti-Al-Si ternary compounds. FAST is capable to manufacture composites from dissimilar constituents, which opens new possibilities for design and manufacturing of architectured materials.

Highlights

Composite, hybrid, heterogeneous and architectured materials consist of two or more constituents and aim to achieve better properties than each of the constituents individually.While composite refer to any material made of two or more constituents, the term ‘hybrid’relates mostly to materials with two constituents at sub-micrometer level [1]
The present study shows a feasibility of Field Assisted Sintering Technique (FAST) for manufacturing of architectured composites consisting of Ti-based bulk and compacted Al6061 matrix (Al)-based powder
Heterogeneous composite material was manufactured from Ti Grade 2 bulk and

Summary

Introduction

Hybrid, heterogeneous and architectured materials consist of two or more constituents and aim to achieve better properties than each of the constituents individually.While composite refer to any material made of two or more constituents, the term ‘hybrid’relates mostly to materials with two constituents at sub-micrometer level [1]. Hybrid, heterogeneous and architectured materials consist of two or more constituents and aim to achieve better properties than each of the constituents individually. While composite refer to any material made of two or more constituents, the term ‘hybrid’. The term ‘heterogeneous’ underlines very dissimilar properties of constituents or domains [2], and, the term ‘architectured’ refers to inner architecture of the material at a length scale intermediate between the microstructural scale and the specimen dimensions focusing on spatial arrangement of constituents [3]. Architectured composites combine two (or more) materials or a material and an empty space (for instance cellular structures) in chosen configuration and scale as pioneered by Ashby and Brechet [4]. Direct laser deposition was successfully used for manufacturing of architectured composite consisting of Inconel matrix and Co-Cr internal structure in a proof-of-concept study [9]

Results

Discussion

Conclusion