Oriented molybdenum or tungsten single crystal and manufacturing method thereof
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United States of America Patent
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Jun 29, 1999
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N/A
app pub date -
Jul 8, 1997
filing date -
Jul 8, 1996
priority date (Note) -
Expired
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Abstract
Secondary recrystallized grains having a plurality of crystal orientations in a polycrystalline compact of molybdenum or tungsten, which contains at least one element selected from the group consisting of calcium and magnesium in amount of 0.007 to 0.090 atom %, are formed by locally heating an end portion(s) of the polycrystalline compact. Some grains, which have a prescribed crystal orientation, selected from these secondary recrystallized grains are subsequently grown in the whole polycrystalline compact by annealing.
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