MICROSTRUCTURES AND MECHANICAL PROPERTIES OF DIRECTIONALLY SOLIDIFIED NiAl–Cr(Mo)–Hf(Ho) EUTECTIC ALLOY
Received date: 2009-10-10
Revised date: 2010-03-19
Online published: 2010-06-11
The alloy with nominal composition of Ni-30.4Al-34Cr-4.3Mo-0.1Hf-0.05Ho (atomic fraction, %) has been directionally solidified at two withdrawal rates by liquid metal (Sn) cooling (LMC) process. Compared to the as-cast alloy, directional solidification process eliminates primary Cr(Mo) phase. With increasing withdrawal rate from 8 to 15 mm/min, the diameter of NiAl/Cr(Mo) eutectic cell decreases from 115 to 85 μm. In addition, the intercellular spaces and disordered regions become less. In virtue of the disappearance of primary Cr(Mo) phase, the mechanical properties of directionally solidified alloys are better than those of as--cast alloy and are further improved with increasing withdrawal rate.
XIAO Xuan , GUO Jian-Ting , XIE Yi . MICROSTRUCTURES AND MECHANICAL PROPERTIES OF DIRECTIONALLY SOLIDIFIED NiAl–Cr(Mo)–Hf(Ho) EUTECTIC ALLOY[J]. Acta Metall Sin, 2010 , 46(6) : 701 -707 . DOI: 10.3724/SP.J.1037.2009.00668
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