Author:
Farber L.,Gotman I.,Gutmanas E. Y.
Abstract
ABSTRACTDense NiAl intermetallic was synthesized from very fine elemental powders via solid state reactions. Homogeneous blends of micron size Ni and Al powders were consolidated to full density and heat treated in a 425–800°C temperature range. During heat treatment, formation of various intermediate intermetallics phases: NiAl3, Ni2A13, Ni3Al and NiAl was observed. The sequence and kinetics of these phase formations at different temperatures were studied employing X-ray diffraction analysis (XRD). A model for a description of synthesis reaction kinetics in Ni-Al blends was developed. Based on the obtained results, the synthesis of NiAl was performed in two stages : reactions in 425–550°C range with consumption of Al, followed by a reaction at up to 800°C. It allowed uncontrolled SHS (self propagating high temperature synthesis, resulting in the occurrence of liquid phases and in formation of reaction products in a very fast /explosive manner) to be avoid. The synthesis temperatures are considerably lower than those used currently in processing of NiAl.
Publisher
Springer Science and Business Media LLC
Reference18 articles.
1. Pressure-assisted reactive synthesis of titanium aluminides from dense 50Al-50Ti elemental powder blends
2. Interdiffusion Kinetics in Thin Film Couples
3. 18. Farber L. , “Synthesis of CoAl and NiAl intermetallics and the intermetallic s based composites from very fine elemental metal powders”, Ph.D Thesis, Technion, Haifa, Israel, 1996.
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献