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| Formation and Precipitation Phases of Ni-Al System Intermetallic Surfacing Layers by Light Beam Heating |
| ZHANG Di; SHAN Jiguo; CHEN Wuzhu; REN Jialie |
| Department of Mechanical Engineering; Tsinghua University; Beijing 100084 |
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Cite this article:
ZHANG Di; SHAN Jiguo; CHEN Wuzhu; REN Jialie. Formation and Precipitation Phases of Ni-Al System Intermetallic Surfacing Layers by Light Beam Heating. Acta Metall Sin, 2004, 40(5): 483-488 .
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Abstract The formation and microstructure of intermetallic surfacing
layers acquired by light beam heating Ni and Al
mixed powder were investigated by means of X-ray
diffraction, SEM, EDXS and microhardness. The results show that the
formation of surfacing layers is related to the heat capacity and
melting point of surfacing materials.
When the surfacing materials with more than
50%Al (atomic fraction) or not more than 25%Al are used, the surfacing layers
with good formation can be obtained. However, too high Al
content results in the decrease of the densification of surfacing
layer. When the surfacing materials contain
50%--75%Al, the surfacing layers entirely consist of
Ni-Al intermetallics (Al1.1Ni0.9, Al3Ni2,
Al3Ni). When the
surfacing material is rich in Ni (not more than 25%Al),
the microstructure is composed of γ-Ni matrix and Ni3Al
intermetallic. Adopting the surfacing material rich in Al (80%Al)
leads to the precipitation of a lot of α-Al, and the
microstructure consists of Al3Ni2 intermetallic
precipitated on hypoeutectic matrix composed of the primary
α-Al and the eutectic of α-Al+Al3Ni.
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Received: 22 May 2003
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