In Situ Studies of Variant Selection During the α—β—α Phase Transformation in Zr-2.5Nb

2010 ◽  
pp. 195-215
Author(s):  
P. Mosbrucker ◽  
M. R. Daymond ◽  
R. A. Holt
Keyword(s):  
Phase Transformation ◽  
Variant Selection ◽  
In Situ Studies ◽  
Α Phase

In Situ Studies of Variant Selection During the α-β-α Phase Transformation in Zr-2.5Nb

2011 ◽  
Vol 8 (1) ◽  
pp. 103066 ◽  
Author(s):  
P. Mosbrucker ◽  
M. R. Daymond ◽  
R. A. Holt ◽  
P. Barberis ◽  
S. W. Dean
Keyword(s):  
Phase Transformation ◽  
Variant Selection ◽  
In Situ Studies ◽  
Α Phase

Quantitative Analysis of Variant Selection and Orientation Relationships during the γ-to-α Phase Transformation in Hot-Rolled TRIP Steels

2010 ◽  
Vol 89-91 ◽  
pp. 359-364 ◽  
Author(s):  
Loïc Malet ◽  
Pascal J. Jacques ◽  
Stéphane Godet
Keyword(s):  
Phase Transformation ◽  
Orientation Relationship ◽  
Hot Deformation ◽  
High Performance ◽  
Statistical Treatment ◽  
Phenomenological Theory ◽  
Variant Selection ◽  
Orientation Relationships ◽  
Α Phase ◽  
Hot Rolled

The orientation relationships that apply to the fcc (γ) – bcc (α) phase transformation in high-performance hot-rolled TRIP-aided steels were characterised by EBSD techniques. A statistical treatment of the experimental data allows the mean orientation relationship to be determined. This mean orientation relationship was compared to the models commonly proposed in the literature and confronted qualitatively to the predictions of the phenomenological theory of martensite crystallography (PTMC). The variant selection phenomenon was also characterized quantitatively at the level of individual austenite grains. The reconstruction of the EBSD maps evidences that bainite grows by packets in which the bainite laths share a common {111}γ plane in the austenite. This growth mechanism is not influenced by the prior hot deformation of the austenite. The hot deformation has a critical influence on the number of packets that forms. The analysis of the crystallographic features of the bainite packets reveals that all possible variants are formed in a packet, though in different proportions.

The influence of rolling temperature on texture evolution and variant selection during α→β→α phase transformation in Ti–6Al–4V

2012 ◽  
Vol 60 (17) ◽  
pp. 6013-6024 ◽  
Author(s):  
G.C. Obasi ◽  
S. Birosca ◽  
D.G. Leo Prakash ◽  
J. Quinta da Fonseca ◽  
M. Preuss
Keyword(s):  
Phase Transformation ◽  
Texture Evolution ◽  
Rolling Temperature ◽  
Variant Selection ◽  
Α Phase

Microstructure and Densification of Sintered (B+C)-Doped β-Silicon Carbide

1993 ◽  
Vol 327 ◽  
Author(s):  
Wolfgang Braue ◽  
Hans-J. Kleebe ◽  
Carsten Wehling
Keyword(s):  
Silicon Carbide ◽  
Phase Transformation ◽  
Surface Layer ◽  
Preliminary Data ◽  
Combined Approach ◽  
Early Stages ◽  
Α Phase ◽  
Powder Particles

AbstractThe role of boron and carbon during densification of sintered β-SiC was investigated through the combined approach of in-situ dilatometry and CTEM/AEM inspection of TEM-foils referring to well-defined densification events. Preliminary data obtained indicate that in the early stages of densification, boron is not enriched in the continuous carbon-rich surface layer covering the β-SiC powder particles nor does it segregate to internal interfaces in high quantities. Small boron quantities are dissolved in the SiC grains- Simultaneously with the β- to α- phase transformation, decomposition of foam-like B4C aggregates releases small B4C particles, which are bound intragranularly to α-SiC.

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