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Abstract:
The morphology, the distribution and crystallographic orientation of TiB in situ formed in TiB/Ti-6Al-4V composite coatings by laser were observed by TEM and EBSD, in order to explore the formation mechanism of tubular TiB. The results show that TiB grains exhibit two morphologies: rod and needle, and which are controlled by growth time and element concentration. Rod-like TiB nucleate in the hypereutectic region, while needle-like TiB nucleate in the eutectic and hypoeutectic region. The growth of (010)(B27) and (001)(Bf) planes would no longer be stable, when the diameter and the growth rate of TiB exceed their critical values. The growth rate in the edge region of TiB is faster than that in the center due to the concentration of boron. TiB grains eventually form a tubular structure because boron element is consumed by the growth of edges that further inhibits the growth of the central region. With the increase of diameter of TiB, the tubular structure appears more frequently.
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Source :
RARE METAL MATERIALS AND ENGINEERING
ISSN: 1002-185X
Year: 2018
Issue: 3
Volume: 47
Page: 915-919
0 . 7 0 0
JCR@2022
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:260
JCR Journal Grade:4
Cited Count:
WoS CC Cited Count: 4
SCOPUS Cited Count:
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 1