Appeal 2007-2359
Application 90/006,951
35. In Series III, three alloys having 0.45, 0.66, and 0.45 Mg were
prepared for studies of the effect of cooling rate after homogenization.
(Reiso at 33, col. 2.)
36. Samples were extruded and examined by scanning electron
microscopy and energy dispersive X-ray analysis. (Reiso at 34, col. 1.)
37. According to Reiso, Mg-rich and Si-rich alloys contained, "in addition
to the primary AlFeSi constituents, coarse phases containing Mg and/or Si
with varying Mg:Si ratios." (Reiso at 34, col. 1.)
38. However, Reiso reports that example 16 "had a negligible amount of
such phases." (Reiso at 34, col. 1.)
39. Reiso also reports that only extrusions of alloy 5 (Si-rich) and alloy 10
(Mg-rich) of Series I showed the coarse Mg-Si phases. (Reiso at 34, col. 1.)
40. Hence, it is reasonable to infer that alloy 6 of Series I showed a
"negligible amount" of coarse Mg-Si phases.
41. Reiso developed a model for damage-limited extrusion of AlMgSi
alloys. (Reiso at 38, col. 2ff.)
42. According to Reiso:
[t]he temperature in the surface of the extrusion is thought to be
the major factor in limiting the extrusion speed for a given
section. For a given extrusion speed (V1) the temperature of the
extrusion will increase with increasing deformation resistance,
i.e., increasing amounts of Mg and Si in solid solution or
increasing cooling rate after homogenization for a given alloy."
(Reiso at 38, col. 2.)
43. Reiso explains that when an alloy contains coarse Mg-Si phases that
are too big to go into solution in a given extrusion process (too low
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