Paper Title:
Elevated Temperature Mechanical Properties of a Directionally Solidified NiAl/Cr(Mo)-Hf Alloy
  Abstract

The microstructure of directionally solidified (DS) NiAl-28Cr-5Mo-1Hf eutectic alloy was investigated by SEM and TEM. The eutectic alloy is composed of NiAl matrix , Cr (Mo) phase and a small amount of Heusler phase. Tensile testing of this alloy was performed from room temperature to 1373K. The brittle-to-ductile transition temperature (BDTT) is dependent on strain rate, with two orders of increase on strain rate resulting in a100K increase in transition temperature. The observation of fracture surface showed that at temperature above BDTT, the fractograph changes from NiAl cleavage and debonding along NiAl/Cr(Mo) interface boundary to ductile in nature.

  Info
Periodical
Key Engineering Materials (Volumes 297-300)
Edited by
Young-Jin Kim, Dong-Ho Bae and Yun-Jae Kim
Pages
1477-1481
DOI
10.4028/www.scientific.net/KEM.297-300.1477
Citation
C. M. Xu, J. T. Guo, X. S. Xie, "Elevated Temperature Mechanical Properties of a Directionally Solidified NiAl/Cr(Mo)-Hf Alloy ", Key Engineering Materials, Vols. 297-300, pp. 1477-1481, 2005
Online since
November 2005
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$32.00
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