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The Formation Process of the Microstructure of Al2O3-Al3Ti-Al In-Situ Composite

Published online by Cambridge University Press:  02 July 2020

H.H. Luo ,
D.Z. Wang ,
H.X. Peng ,
Cheng Liu  and
C.K. Yao
H.H. Luo
Affiliation:
P.O.Box:433, Harbin Institute of Technology, Harbin, 150001, P.R.China
D.Z. Wang
Affiliation:
P.O.Box:433, Harbin Institute of Technology, Harbin, 150001, P.R.China
H.X. Peng
Affiliation:
P.O.Box:433, Harbin Institute of Technology, Harbin, 150001, P.R.China
Cheng Liu
Affiliation:
P.O.Box:433, Harbin Institute of Technology, Harbin, 150001, P.R.China
C.K. Yao
Affiliation:
P.O.Box:433, Harbin Institute of Technology, Harbin, 150001, P.R.China
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Extract

In the last decade, new in-situ processing techniques, such as DIMOX™, XD™, VLS and SHS, for fabricating metal and intermetallic matrix composites have emerged. It is expected that the in-situ formed composites may reveal not only excellent dispersion of fine reinforcing particles, but high thermodynamical stability and high temperature performance. The fully dense Al2O3-Al3Ti-57Vol%Al composite was in-situ processed by combing combustion synthesis with squeeze casting utilizing the reaction between TiO2 powder (with average diameter of 0.6μm and volume fraction of 14%) and pure Al (99.5%). First, the 14Vol%TiO2/Al bulk materials were fabricated via squeeze casting method, subsequently, the TiO2/Al materials were heat treated to form final in-situ composites. Using XRD, SEM, TEM and HRTEM techniques, the microstructure and its evolution were investigated.

The X-ray diffraction pattern of the composite is shown in Fig.1 which indicates that the composite is composed of A12O3, Al3Ti and Al. According to the reaction formula between TiO2 and Al the volume fraction of Al in the composite is about 57%. Fig.2 is a typical scanning electron micrograph of the composite.

Type
Ceramics and Ceramic Composites
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 727 - 728
Copyright
Copyright © Microscopy Society of America 1997

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References

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