Authors: M Cabibbo E Evangelista
Publish Date: 2006/06/06
Volume: 41, Issue: 16, Pages: 5329-5338
Abstract
The microstructural evolution with strain was investigated in a Zrmodified 6082 Al–Mg–Si alloy and in the same alloy added with 0117 wt Sc subjected to a multipass equalchannel angular pressing up to a true strain of ∼12 The role of fine Al3Sc1x Zr x dispersoids pertaining Al–Mg–Si–Sc–Zr alloy and Al3Zr dispersoids pertaining to Al–Mg–Si–Zr alloy was investigated by transmission electron microscopy techniques and discussed Compared to the commercial parent alloy Al–Mg–Si block wall formation and propagation were favored by the presence of Sc–Zr containing dispersoids while cell boundary evolution was less affected Al3Zr dispersoids affected the microstructure in a similar way but in a lesser extent Mean misorientation across block walls increased with strain much more in the Sc–Zr containing alloy reaching a plateau starting from a true strain of ∼8 Misorientation across cell boundaries continuously increased to ∼8° and ∼5° for the Sc–Zr and Zr containing alloy respectively The effect of the presence of Al3Sc1x Zr x and Al3Zr in the matrix on the Mg2Si particle shearing and Si shrinking phenomena with strain was also addressed and documented
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