Abstract
In an effort to superimpose two different elevated temperature strengthening mechanisms in NiAl, one lot of an oxide dispersion strengthened (ODS) NiAl powder has been milled in liquid nitrogen (cryomilled) to introduce A1N particles at the grain boundaries, and a second lot of ODS powder was simply roasted in gaseous nitrogen as an alternative means to produce AIN reinforced grain boundaries. Powder from both of these lots as well as the starting material have been consolidated by hot extrusion and tested at 1300 K. Both nitrogen roasting and cryomilling produced AIN within the ODS NiAl matrix which strengthened the alloy; however, based on the AIN content, cryomilling is more effective.
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Acknowledgement
JDW would like to acknowledge the financial support of the Alexander von Humboldt foundation during his stay at Max-Planck-Institut fir Werkstoffwissenschaft, Stuttgart.
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Daniel Whittenberger, J., Grahle, P., Arzt, E. et al. Powder Processing of NiAl for Elevated Temperature Strength. MRS Online Proceedings Library 460, 487–492 (1996). https://doi.org/10.1557/PROC-460-487
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DOI: https://doi.org/10.1557/PROC-460-487