Abstract
UHV, zone-refined, high-purity molybdenum single crystals, with the residual resistivity ratio between 293 and 4.2 K larger than 8000, oriented near the middle of the unit stereo triangle were deformed in tension in liquid nitrogen. The crystals show pronounced anomalous {110} slip with coarse and straight slip lines. Transmission electron microscopy (TEM) revealed that the anomalous {110} slip consists of lamellar network structures of irregular shaped screw dislocations aligned in the {110} plane. These observations are compared with those in V(a) metals, and it is concluded that the anomalous {110} slip observed in molybdenum is of the same nature with that in V(a) metals. The appearance of the anomalous {110} slip is successfully explained by the mechanisms already proposed by the present authors. The difference in persistence of the anomalous slip between that in V(a) metals and in molybdenum is discussed in terms of the stability of the anomalous slip band.
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