Journal of the Japan Institute of Metals and Materials
Online ISSN : 1880-6880
Print ISSN : 0021-4876
ISSN-L : 0021-4876
Electron Microscopy Study of the Structure of Quenched Ti-6%Mo Alloy
Muneo Oka
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1965 Volume 29 Issue 12 Pages 1141-1147

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Abstract

The sub-structures of the martensite in a quenched Ti-Mo alloy have been investigated by means of transmission electron microscopy, and also the microhardness and X-ray measurement have been made. The results are as follows:
(1) In X-ray and electron diffraction patterns of the quenched Ti-6%Mo alloy, the spots due to the α-phase (h.c.p.) were found, but the spos due to the β-phase (b.c.c.) or ω-phase (hexagonal) were not.
(2) In the quenched specimens, the needle-shaped markings found by optical microscopy were observed as the banded martensites (α-phase) by transmission electron microscopy. Besides, a large number of small lenticular martensites were observed in the other regions in a greater part of the specimen. The hardness of this specimen was about 337 VHN on the average.
(3) The lattice defects in the banded martensites were {10\bar11} transformation twins and dislocations on (0001) planes. And there were two kinds of the banded martensites: one contained only dislocations and other dislocations and transformation twins, and the latter was more frequently observed than the former.
(4) The lattice parameters of the martensite in Ti-6%Mo alloy a=2.928, c=4.665, ca=1.593 were obtained by the X-ray measurement.

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