EUROMAT 99, Intermetallics and Superalloys: Materials by Pierre Caron, D. G. Morris, S. Naka, A. Dlouhy, P. Caron

By Pierre Caron, D. G. Morris, S. Naka, A. Dlouhy, P. Caron

Intermetallics at the moment are as regards to the industrial program degree. TiAl-based alloys convey reliable high-temperature particular stiffness and power, whereas different intermetallics, akin to the iron aluminides and silicide-based fabrics, are in particular beautiful as a result of their solid corrosion or oxidation resistance.
This publication reports actions that relate to advancements in processing equipment and advances within the realizing of the property/microstructure relationship.

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Extra resources for EUROMAT 99, Intermetallics and Superalloys: Materials Development and Processing

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51 5 Conclusions The Md-method is not simply based on the electronegativity of the free atoms of the alloying element but also considers some interactions between the single atom and its environment in the alloy. Nevertheless, the interaction range in the Md-method is restricted to the cluster in which the Md-number is calculated and only interaction effects with Ni and Al are considered. Another shortcoming of the Md-method is that critical values for the precipitation of TCPphases do not result out of the Md-theory but have to be introduced empirically, similar to the Nv-method.

Therefore the following mechanisms were discussed: • &LUFXPYHQWLRQRIWKH¶SDUWLFOHVE\FOLPE • &LUFXPYHQWLRQRIWKH¶SDUWLFOHVE\WKH2URZDQPHFKDQLVP • &XWWLQJRIWKH¶SDUWLFOHV In the regime of low stresses and high temperatures we suppose that the deformation is EDVHG RQ JOLGHFOLPE PRWLRQ RI GLVORFDWLRQV DORQJ WKH ¶LQWHUIDFH >10,11], provided the WKUHVKROG VWUHVVHV IRU RWKHU PHFKDQLVPV OLNH WKH FXWWLQJ RU WKH FLUFXPYHQWLRQ RI WKH ¶ particles by Orowan bowing are not exceeded.

Nabarro et al. [3] and Louchet and Hazotte [7] introduced a new contribution which takes into account an additional factor to the driving force which is due to the change of the volume occurring loFDOO\GXULQJWKHUDIWLQJSURFHVVEHFDXVHRIWKHGLIIHUHQWVL]HVRIWKHXQLWFHOOVRIDQG¶,Q the present work, the model of Socrate and Parks which takes into account the plastic deformation and which applies the method of finite elements (FE) using an energy-perturbation approach [5] will be extended by the introduction of a further contribution to the driving force for rafting, cf.

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