Non-sag Tungsten Wire(1)

Non-sag tungsten wire, namely doped tungsten wire, which is widely applied to lighting industry.

Large elongated grains are obtained by primary and secondary recrystallization, which are regarded as the desired microstructure to gain necessary creep resistance. A few of the grains will grow massive in secondary recrystallization, which often called abnormal grain growth. The mechanisms of normal and abnormal grain growth are basically the same, involving high angle boundary migration and driven by the reduction of surface energy. For a few of the grains, the abnormal grain growth can be visualized as a growth advantage while growth disadvantage for the majority. Such an advantage/disadvantage may be caused by (1) differences in grain size and/or(2) differences in grain boundary character distribution (GBCD). In other words, a grain may grow massive if it has large size and/or possibilities of more favorable (i.e., of higher mobility) grain boundaries with the matrix grains.

 

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