โ Scribed by R.W. Anderson; S.E. Bronisz
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Recently, Barrett and Bakish were able to cause deformation twinning in tantalum by impact working at liquid nitrogen temperature, but not at dry ice or room temperatures.(l)
Bechtold had previously reported THE EDITOR Bechtold reported 0.01% nitrogen and 0.010% carbon. At this laboratory, during the course of an investigation of tantalum as a reactor material, twinning of high purity tantalum has been observed after impact ACTA METALLURGICA, VOL. 7, 1959 TABLE 1. Chemical analysis of electron beam melted tantalum ~~~~~~[~~rnent 1 p.p.m.
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Twinning in zirconium may, or may not occur by a dislocation mechanism. Two of the observed twinning modes can be explained by the use of relatively simple dislocation models. For a third mode, however, the model is very complex. ## MACLAGE DANS LE ZIRCONIUM Le maclage dans le zirconium peut avoi
FIG. 4. Substructures produced in austenitic 18 Cr-12 Ni-Nb steel weld metal, showing a region of transition from cell to columnar dendritio structure. x 280 such a way it might be possible to control the mechanical properties of weld metal more precisely.