Amorphous Intergranular Film Effect on the Texture and Structural Evolution During Cold-Rolling of Nanocrystalline Ni–Zr Alloys

2022 ◽  
Author(s):  
K. Vijay Reddy ◽  
Timothy J. Rupert ◽  
Snehanshu Pal
Keyword(s):  
Cold Rolling ◽  
Structural Evolution ◽  
Zr Alloys

Strengthening of Nickel Deformed by High Pressure Torsion

2008 ◽  
Vol 584-586 ◽  
pp. 417-421 ◽  
Author(s):  
Hong Wang Zhang ◽  
X. Huang ◽  
Niels Hansen ◽  
Reinhard Pippan ◽  
Michael Zehetbauer
Keyword(s):  
High Pressure ◽  
Cold Rolling ◽  
High Pressure Torsion ◽  
Structural Evolution ◽  
Longitudinal Section ◽  
High Angle ◽  
Microstructural Parameters ◽  
Transmission Electron ◽  
Structure Relationship ◽  
Von Mises

The strength of a deformed metal depends on the content of high angle boundaries, low angle dislocation boundaries and the dislocations between the boundaries. High angle boundaries contribute by Hall-Petch strengthening, whereas for the low angle dislocation boundaries and dislocations between boundaries the strengthening is proportional to the square root of the dislocation density. Based on an assumption of additivity of these contributions, the flow stresses of metals deformed by cold rolling have been calculated successfully. In the present investigation pure Ni (99.9%) has been deformed by high pressure torsion (HPT) to von Mises strains of 0.9, 1.7, 8.7 and 12. The strength of the HPT Ni has been determined by Vickers microhardness (HV) measurements and the microstructural parameters have been determined by transmission electron microscope (TEM) in the longitudinal section. HPT has been compared with deformation by cold rolling and torsion based on the structural evolution with strain and the stress-structure relationship. Based on an assumption of a linear additivity of boundary strengthening and dislocation strengthening, good agreement has been found between the calculated and the experimental flow stress.

Internal structural evolution and enhanced tensile plasticity of Ti-based bulk metallic glass and composite via cold rolling

2014 ◽  
Vol 615 ◽  
pp. S113-S117 ◽  
Author(s):  
J.M. Park ◽  
K.R. Lim ◽  
E.S. Park ◽  
S. Hong ◽  
K.H. Park ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Cold Rolling ◽  
Bulk Metallic Glass ◽  
Structural Evolution

Characterization of Two Ti-Nb-Hf-Zr Alloys Under Different Cold Rolling Conditions

2011 ◽  
Vol 20 (4-5) ◽  
pp. 653-657 ◽  
Author(s):  
M. González ◽  
F. J. Gil ◽  
J. M. Manero ◽  
J. Peña
Keyword(s):  
Cold Rolling ◽  
Zr Alloys

scholarly journals Investigation of Particles and Gas Bubbles in Zr–0.8Sn–1Nb–0.3Fe Zr Alloys Irradiated by Krypton Ions

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2056
Author(s):  
Wenzhu Shen ◽  
Chenwei Liu ◽  
Penghui Lei ◽  
Guang Ran
Keyword(s):  
Cold Rolling ◽  
Bubble Size ◽  
Bubble Growth ◽  
Bubble Formation ◽  
Gas Bubbles ◽  
Irradiation Temperature ◽  
Face Centered Cubic ◽  
Face Centered ◽  
Fcc Structure ◽  
Zr Alloys

Two types of Zr–0.8Sn–1Nb–0.3Fe Zr alloys were irradiated by krypton ions in the temperature range from 320 to 400 °C. The microstructure of the as-received alloys showed that the sizes of Zr crystals and (Zr, Nb)2Fe particles with face-centered cubic (FCC) structure increased from 3.9 μm to 6.0 μm and from 74.6 nm to 89.6 nm, respectively, after cold rolling and subsequent annealing. Kr+ irradiation-induced bubble formation in the Zr matrix was observed. The size of the gas bubbles increased with increasing ion fluence and irradiation temperature. An equation that related the bubble size, ion fluence, and temperature were established. Irradiation-induced amorphization of particles was observed and found to be related to the fabrication process and irradiation parameters. The particles in alloy #1 showed a higher irradiation tolerance than those in alloy #2. The threshold damage dose for the amorphization of particles in alloy #2 was 3.5 dpa at 320 °C and 4.9 dpa at 360 °C. The mechanisms for bubble growth and particle amorphization are also discussed.

Structural Evolution of Cold Rolled Multi-Layers in the Al-Cu-Fe Ternary System

2003 ◽  
Vol 805 ◽  
Author(s):  
J. S. Park ◽  
E. Fleury ◽  
J. H. Kim ◽  
H. J. Chang ◽  
W. T. Kim ◽  
...  
Keyword(s):  
Ternary System ◽  
Cold Rolling ◽  
Thermal Analyses ◽  
Structural Evolution ◽  
Target Composition ◽  
Cold Rolled

ABSTRACTSamples with a target composition of Al62.5Cu25Fe12.5 (at.%) have been produced from the repeated cold rolling and folding (R&F) process of Al, Cu and Fe elemental foils. Upon early increments of the R&F cycle, the mechanically-induced process led to the fragmentation of the initial foils, which resulted in the dispersion of elemental Fe layers through the refined Al and Cu layers. After 40 R&F cycles the Al2Cu phase was detected, while Fe did not contribute to the formation of compounds. Thermal analyses suggested that the formation and dissolution of the Al2Cu and Al7Cu2Fe phases are critical steps for the synthesis of the i-phase during post-R&F treatment. Annealing between 650° and 750°C enabled the formation of the stable i-phase and resulted in high values of the microhardness.

Phase transformation and structural evolution in a Ti-5at.% Al alloy induced by cold-rolling

2020 ◽  
Vol 49 ◽  
pp. 211-223 ◽  
Author(s):  
Bingqiang Wei ◽  
Song Ni ◽  
Yong Liu ◽  
Xiaozhou Liao ◽  
Min Song
Keyword(s):  
Phase Transformation ◽  
Cold Rolling ◽  
Structural Evolution ◽  
Al Alloy

scholarly journals Mechanical Properties of Thermomechanically-Processed Metastable Beta Ti-Nb-Zr Alloys for Biomedical Applications

2012 ◽  
Vol 706-709 ◽  
pp. 455-460 ◽  
Author(s):  
Vladimir Brailovski ◽  
Sergey Prokoshkin ◽  
Karine Inaekyan ◽  
Sergey Dubinskiy ◽  
Maxime Gauthier
Keyword(s):  
Mechanical Properties ◽  
Cyclic Loading ◽  
Cold Rolling ◽  
Biomedical Applications ◽  
Biomedical Implant ◽  
Beta Titanium ◽  
Static And Cyclic Loading ◽  
Metastable Beta ◽  
Beta Titanium Alloys ◽  
Zr Alloys

Metastable beta-titanium alloys combine exceptionally low Young's modulus and high biocompatibility, thus attracting special interest in the prospect of their application as biomedical implant material. In this work, Ti-21.8Nb-6Zr (at.%) ingots were manufactured by vacuum argon melting followed by hot isothermal pressing. The obtained ingots were thermomechanically processed using the following TMP sequence: a) cold rolling (CR) from e=0.37 to 2 of the logarithmic thickness reduction; and b) post-deformation annealing (PDA) of between 450 and 700°C (10’…5 h for 600°C and 1 h for other temperatures). The influence of the TMP on the alloy’s mechanical properties under static and cyclic loading was studied.

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