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Abstract:
The effect of extrusion
temperature and speed on mechanical properties, surface quality and
intergranular corrosion of extruded LY11 duralumin sections has been
studied. The mechanical properties obtained under the conditions of
higher extruding temperature and suitable flow speed were comparable to
that of usual quenching process, while the surface quality desired was
retained. The strengthening mechanism of this alloy quenched on
extrusion press was also discussed. The strength decrease caused by the
uncomplete solid solution in this process was compensated by the
strength increase led by the appearance of vacancy sites and the
substructure with high dislocation density.
Key words:
Duralumin
Microstructure Nature aging
Received
19921010, received in revised form 19930328
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