Mechanism of deformation-twin formation in nanocrystalline metals

2007 ◽  
Vol 49 (5) ◽  
pp. 874-882 ◽  
Author(s):  
M. Yu. Gutkin ◽  
I. A. Ovid’ko ◽  
N. V. Skiba
Keyword(s):  
Deformation Twin ◽  
Nanocrystalline Metals ◽  
Twin Formation

Effect of Mo addition on the crystal texture and deformation twin formation in Zr-based alloys

2001 ◽  
Vol 295 (1) ◽  
pp. 31-41 ◽  
Author(s):  
Y.B Chun ◽  
S.K Hwang ◽  
M.H Kim ◽  
S.I Kwun ◽  
S.W Chae
Keyword(s):  
Deformation Twin ◽  
Crystal Texture ◽  
Twin Formation

Strain-induced martensite effects on transgranular carbide precipitation in type 304 stainless steels

1991 ◽  
Vol 49 ◽  
pp. 604-605
Author(s):  
A.H. Advani ◽  
L.E. Murr ◽  
D. Matlock
Keyword(s):  
Heat Treatment ◽  
Grain Boundary ◽  
Stress Corrosion Cracking ◽  
Stainless Steels ◽  
Deformation Twin ◽  
Austenitic Stainless Steels ◽  
Carbide Precipitation ◽  
Strain Induced Martensite ◽  
Type 304

Thermomechanically induced strain is a key variable producing accelerated carbide precipitation, sensitization and stress corrosion cracking in austenitic stainless steels (SS). Recent work has indicated that higher levels of strain (above 20%) also produce transgranular (TG) carbide precipitation and corrosion simultaneous with the grain boundary phenomenon in 316 SS. Transgranular precipitates were noted to form primarily on deformation twin-fault planes and their intersections in 316 SS.Briant has indicated that TG precipitation in 316 SS is significantly different from 304 SS due to the formation of strain-induced martensite on 304 SS, though an understanding of the role of martensite on the process has not been developed. This study is concerned with evaluating the effects of strain and strain-induced martensite on TG carbide precipitation in 304 SS. The study was performed on samples of a 0.051%C-304 SS deformed to 33% followed by heat treatment at 670°C for 1 h.

Formation of coherent twins in YBa2Cu3O7–δ superconductors

1989 ◽  
Vol 4 (4) ◽  
pp. 795-801 ◽  
Author(s):  
C. J. Jou ◽  
J. Washburn
Keyword(s):  
Oxygen Uptake ◽  
Growth Mechanism ◽  
Oxygen Uptake Rate ◽  
Nucleation And Growth ◽  
Electron Microscopic ◽  
Transmission Electron ◽  
Transmission Electron Microscopic ◽  
Twin Formation ◽  
Boundary Model ◽  
Nucleation And Growth Mechanism

A nucleation-and-growth mechanism for the twin formation in YBa2Cu3O7–δ superconductors based on the oxygen uptake rate curve and published transmission electron microscopic observations is proposed together with an oxygen-depleted twin boundary model. The difficulty of reaching stoichiometric YBa2Cu3O7 is explained.

Anomalous deformation behavior and twin formation of Ni-base superalloys at the intermediate temperatures

2011 ◽  
Vol 528 (24) ◽  
pp. 7149-7155 ◽  
Author(s):  
I.S. Kim ◽  
B.G. Choi ◽  
H.U. Hong ◽  
Y.S. Yoo ◽  
C.Y. Jo
Keyword(s):  
Deformation Behavior ◽  
Twin Formation

Characterization of the Effect of Cr Additions to TiAl-Base Alloys

1990 ◽  
Vol 186 ◽  
Author(s):  
Shyh-Chin Huang ◽  
Ernest L. Hall
Keyword(s):  
Mechanical Behavior ◽  
Phase Stability ◽  
Single Phase ◽  
Site Occupancy ◽  
Volume Ratio ◽  
Deformation Mode ◽  
Twin Formation

AbstractTernary TiAl-base alloys containing Cr have been studied, using rapidsolidification processed materials. The mechanical behavior has been characterized and related to other results on microstructure, site occupancy, phase stability, and deformation mode. It was found that Cr additions enhance the plasticity of duplex γ+a2 alloys, but not single-phase alloys. The ductilization effect of Cr is partially due to its ability to occupy Al lattice sites and modify the Ti-Al bond. It is also partially due to its ability to promote twin formation, by modifying the Al partitioning and therefore the a2/γ volume ratio in transformed regions.

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