Paper Titles
Microstructural Modification of Metallic Materials by Electromagnetic Processing and the Theoretical Interpretation
p.123
Approaches to the Design and Processing of Novel Titanium Alloys
p.127
Microstructure and Morphology of Alumina-Iron Nanocomposite Powders Produced by High Energy Mechanical Milling
p.131
Characterisation of Ti(Al,O)-Al2O3 Composite Powders and Thermally Sprayed Coatings
p.135
Ultrafine Grained Ti-47Al-2Cr (at%) Alloy Prepared by High Energy Mechanical Milling and Hot Isostatic Pressing
p.139
Effect of Composition on the Morphology and Hardness of Nanostructured Cu Based Composite and Alloy Powders/Granules Produced by High Energy Mechanical Milling
p.143
A Novel Process for Lowering the Cost of Titanium
p.147
Effect of Carbon Addition on the Microstructure and Properties of M3:2 High Speed Steels Processed by Powder Metallurgy
p.153
Consolidation of TiAl Powder by Thermal Spray Processes
p.159

Ultrafine Grained Ti-47Al-2Cr (at%) Alloy Prepared by High Energy Mechanical Milling and Hot Isostatic Pressing

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Abstract:

Gamma TiAl based alloys are important materials with potential applications in aerospace and automotive applications due to their high specific strength and creep resistance. The major barrier for their applications is their limited ductility at room temperature and limited hot workability. One way of overcoming this barrier is to reduce the grain sizes to ultrafine grained (<500μm) or nanostructured (<100nm) level. In our present study, we attempt to produce bulk ultrafine grained Ti- 47Al-2Cr (at%) alloy using a combination of high energy mechanical milling of elemental powders to produce a very fine structured Ti/Al/Cr composite powder and consolidation of the powder using hot isostatic pressing (HIPping). It was confirmed that high energy ball milling using a planetary ball mill led to the formation of extremely fine Ti and Al layered composite structure. The thermal behaviour of the powder was studied using differential thermal analysis, and it was shown that the reactions between the Ti and Al phases in the fine structured composite powder occur at fairly low temperatures, below the melting point of the Al phase (660oC). The macrostructure and phase structure of the HIPped samples were also examined using optical and scanning electron microscopy and X-ray diffractometry (XRD). This paper is to report and discuss the results of this investigation.

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Periodical:

Advanced Materials Research (Volumes 29-30)

Pages:

139-142

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.29-30.139

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Online since:

November 2007

Authors:

Vijay Nadakuduru, Peng Cao, De Liang Zhang, Brian Gabbitas

Keywords:

High Energy Mechanical Milling, Hot Isostatic Pressing (HIP), TiAl Alloys

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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