MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A CAST NiAl-Cr(Mo)-Ti EUTECTIC ALLOY

Acta Metall Sin

2006, Vol. 42

Issue (10): 1031-1035 DOI:

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MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A CAST NiAl-Cr(Mo)-Ti EUTECTIC ALLOY

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中国科学院金属研究所

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;. MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A CAST NiAl-Cr(Mo)-Ti EUTECTIC ALLOY. Acta Metall Sin, 2006, 42(10): 1031-1035 .

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Abstract Microstructure and mechanical properties of a cast Ni-32Al-28Cr-3Mo-4Ti eutectic alloy have been investigated. The results show that the alloy consists of NiAl and Cr(Mo) eutectic zone, as well as a small amount of primary NiAl and Ni2AlTi. Its compressive yield strength surpasses Dy-doped NiAl-Cr(Mo) eutectic alloy, and is comparable to NiAl-28Cr-5Mo-1Hf eutectic alloy, indicating the addition of Ti is benefit to the strength of NiAl-Cr(Mo) eutectic alloy. Similar to the relationship between minimum creep rate and applied stress, the creep rupture life at 1000℃ vs. applied stress fits linear dual-logarithmic relationship. Modified Monkman-Grant equation can be used to describe the relationship between creep rupture life and minimum creep rate. The fracture mechanism at room temperature is cleaving of NiAl and Cr(Mo) eutectic phases as well as stripping of NiAl/Cr(Mo) interface, while the formation and aggregation of microvoids on eutectic boundaries leads to crept fracture.

Key words: intermetallics NiAl eutectic microstructure mechanical properties

Received: 14 March 2006

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