In Situ TiB2 Reinforced Al-12Si Alloy Composites by Semisolid Processing

2011 ◽  
Vol 675-677 ◽  
pp. 763-766 ◽  
Author(s):  
Zong Ning Chen ◽  
Tong Min Wang ◽  
Jun Xu ◽  
Jing Zhu ◽  
Hong Wang Fu ◽  
...  
Keyword(s):  
Synthesis Method ◽  
High Strength ◽  
Semisolid Slurry ◽  
Matrix Composites ◽  
Semisolid Processing ◽  
Eutectic Si ◽  
Average Size ◽  
Tib2 Particles ◽  
Particulate Reinforced

Employing a cooling slope technique to produce semisolid slurry, in-situ 3wt%TiB2 particulate reinforced Al-12Si alloy composites have been successfully fabricated by flux-assisted synthesis method. It has been shown that the minute TiB2 particles with size 200-500nm uniformly distribute in the spherical α-Al structure and at the boundary of the eutectic Si. Two groups of contrast experiments with and without flowing on the slope have been performed to investigate the influence of the semisolid processing on the microstructure of the composites. Results have shown that α-Al grain is rather spherical and with an average size of 47.4μm, which indicates semisolid processing can be a potential route to produce metal matrix composites with high strength and good ductility.

Effect of Hot Extrusion on the Microstructure of In Situ TiB2 Particulate Reinforced Magnesium Matrix Composite

2011 ◽  
Vol 675-677 ◽  
pp. 473-476 ◽  
Author(s):  
N.N. Wu ◽  
C.F. Fang ◽  
Yun Bai ◽  
L.G. Meng ◽  
Hai Hao ◽  
...  
Keyword(s):  
Matrix Composite ◽  
Hot Extrusion ◽  
Magnesium Matrix Composite ◽  
Magnesium Matrix ◽  
The Matrix ◽  
Tib2 Particles ◽  
Deformation Modes ◽  
Particulate Reinforced ◽  
Main Deformation

The TiB2/AZ31 magnesium matrix composite was fabricated via self-propagating hightemperature synthesis (SHS) and then hot extruded. The influence of hot extrusion on the microstructure and property of TiB2/AZ31 composites was investigated. The results show that hot extrusion and synthesized TiB2 particles could refine the grain size obviously. The synthesized TiB2 particles are micro- and nano-sized, dispersing homogenously in the matrix. The interface between the matrix and the particles are good bonding. Meanwhile, slip and twinning are the main deformation modes during the hot extrusion. The fracture surface of hot-extruded TiB2/AZ31 magnesium matrix composite has more dimples than the as-cast AZ31 magnesium alloy. The improvement of microstructure seems to be beneficial for the fracture ductility of TiB2/AZ31 magnesium matrix composite.

Microstructure of In Situ Al3Ti0.4Zr0.6p/Al Fabricated with Electromagnetic Field

2011 ◽  
Vol 284-286 ◽  
pp. 2280-2283 ◽  
Author(s):  
Gui Rong Li ◽  
Xun Yin Zhang ◽  
Yi Nan Zhao ◽  
Fei Yuan ◽  
Ting Wang Zhang ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Intermetallic Compound ◽  
Uniform Distribution ◽  
Raw Materials ◽  
Aluminum Matrix ◽  
Atomic Ratio ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Average Size

The K2TiF6,K2ZrF6powder and aluminum were selected as the raw materials to in situ synthesize the particulates reinforced aluminum matrix composites. During the fabrication process the electromagnetic field was imposed. The atomic ratio of Al/Ti/Zr in the particulates is determined as 3/0.4/0.6. The Al3Ti0.4Zr0.6is a new kind of intermetallic compound, some properties of which fall in between those of Al3Ti and Al3Zr. Electromagnetic field plays an important part in fining particles and promoting their uniform distribution. When the electromagnetic induced intensity is 0.05T the particles have 0.5-2μm average size and uniform distribution in matrix. The crystal grains of matrix resemble equiaxed ones. The average size of grains are nearly 100μm, 50μm and 25μm when the electromagnetic induced intensities are 0, 0.025T and 0.05T seperately.

In situ hot-stage TEM study of a diffusion-bonded Al/SiC interface

1992 ◽  
Vol 50 (1) ◽  
pp. 218-219
Author(s):  
P. L. Ratnaparkhi
Keyword(s):  
Interfacial Structure ◽  
Matrix Composites ◽  
Reactive Metal ◽  
The Past ◽  
Covalently Bonded ◽  
Metal Ceramic ◽  
Commercially Important ◽  
Ceramic Interfaces ◽  
Particulate Reinforced

Metal/ceramic interfaces have been of great scientific and technological interest for the past two decades. Most studies have been performed on commercially important ceramic-fibre and particulate-reinforced metal-matrix composites. In this investigation, the interfacial structure and chemistry at a diffusion bonded Al/SiC interface was examined at the atomic level in order to understand the fundamental principles that govern bond formation in the solid state between a low temperature non-reactive metal and a high-temperature covalently bonded ceramic.

Preparation and Microstructure of Nano ZrB2 Reinforced Aluminum Matrix Composites

2013 ◽  
Vol 575-576 ◽  
pp. 179-182
Author(s):  
Hong Ming Wang ◽  
Guirong Li ◽  
Yun Cai ◽  
Yu Tao Zhao
Keyword(s):  
Molten Aluminum ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Direct Reaction ◽  
Matrix Composites ◽  
Liquid Reaction ◽  
Particulate Reinforced ◽  
Electronic Microscope ◽  
Observation Results

The ZrB2 particulate reinforced aluminum matrix composites were fabricated via melt direct reaction method using Al-K2ZrF6-KBF4 components. 850°C and 30 min were the optimized synthesizing temperature and reaction time separately. The metallurgical thermodynamic and kinetic processes were then analyzed in detail. It reveals that the interphases include Al3Zr, AlB2, [Z and [ atoms. The ZrB2 particulates can be acquired through the molecular combination between Al3Zr and AlB2 or atomic combination between Zr and B atomics. The in situ reaction between reactive salts and molten aluminum takes place spontaneously, which exhibits the character of liquid-liquid reaction. Scanning electronic microscope observation results demonstrate that the sizes of ZrB2 particulates are almost 100-200 nm. The intervals between particles are almost 200-400 nm, demonstrating a unirom status of distribution.

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