1. Hot Pressing of Plasma-Sprayed SiC Fiber-Reinforced Ti-6Al-4V Alloy
- Author
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WS Johnson, JE Masters, DW Wilson, T Valente, and F Carassiti
- Subjects
Inert ,Fabrication ,Materials science ,Polymers and Plastics ,Scanning electron microscope ,Composite number ,Metallurgy ,Titanium alloy ,Hot pressing ,Microstructure ,visual_art ,Materials Chemistry ,Ceramics and Composites ,Aluminium alloy ,visual_art.visual_art_medium ,Composite material - Abstract
Advanced titanium alloy metal matrix composites offer significant mechanical improvements over many conventional materials. In order to minimize fiber-matrix chemical reactions due to high temperatures involved in the fabrication methods, the final component can be obtained using two different steps: (1) fabrication of preforms (monotapes) by inert plasma spraying and (2) hot pressing of the fabricated preforms. Continuous SiC fiber-reinforced Ti-6Al-4V preforms were hot pressed to fabricate a composite multilayer. Different values of hot pressing processing parameters (temperature, applied load, bonding time) were investigated on the basis of a two-level factorial design. Metallographic and scanning electron microscopy (SEM) analyses were carried out to evaluate the bonding degree of the fabricated preforms. Preliminary three-point bending tests were also performed to understand the mechanical behavior and to show the more suitable values of the processing parameters for a hot pressing procedure. These values should be in the range of 830 to 950°C (temperature), 80 MPa (applied stress), 20 to 30 min bonding time to avoid undesired phase transformation, large plastic flow of the metal matrix, and detrimental chemical reaction at fiber-matrix interface.
- Published
- 1996
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