scholarly journals Estimation of diffusional effects on solution hardening at high temperatures in single phase compositionally complex body centered cubic alloys

2019 ◽  
Vol 172 ◽  
pp. 135-137 ◽  
Author(s):  
S.I. Rao ◽  
C. Woodward ◽  
B. Akdim ◽  
E. Antillon ◽  
T.A. Parthasarathy ◽  
...  
Keyword(s):  
High Temperatures ◽  
Single Phase ◽  
Body Centered Cubic ◽  
Solution Hardening

scholarly journals Irradiation Behaviors in BCC Multi-Component Alloys with Different Lattice Distortions

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 706
Author(s):  
Yue Su ◽  
Songqin Xia ◽  
Jia Huang ◽  
Qingyuan Liu ◽  
Haocheng Liu ◽  
...  
Keyword(s):  
Single Phase ◽  
Vacuum Arc ◽  
Face Centered Cubic ◽  
Body Centered Cubic ◽  
Chemical Complexity ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Lattice Distortions ◽  
Face Centered ◽  
Displacement Per Atom

Recently, the irradiation behaviors of multi-component alloys have stimulated an increasing interest due to their ability to suppress the growth of irradiation defects, though the mostly studied alloys are limited to face centered cubic (fcc) structured multi-component alloys. In this work, two single-phase body centered cubic (bcc) structured multi-component alloys (CrFeV, AlCrFeV) with different lattice distortions were prepared by vacuum arc melting, and the reference of α-Fe was also prepared. After 6 MeV Au ions irradiation to over 100 dpa (displacement per atom) at 500 °C, the bcc structured CrFeV and AlCrFeV exhibited significantly improved irradiation swelling resistance compared to α-Fe, especially AlCrFeV. The AlCrFeV alloy possesses superior swelling resistance, showing no voids compared to α-Fe and CrFeV alloy, and scarce irradiation softening appears in AlCrFeV. Owing to their chemical complexity, it is believed that the multi-component alloys under irradiation have more defect recombination and less damage accumulation. Accordingly, we discuss the origin of irradiation resistance and the Al effect in the studied bcc structured multi-component alloys.

Solution hardening in body-centered cubic quaternary alloys interpreted using Suzuki's kink-solute interaction model

2019 ◽  
Vol 165 ◽  
pp. 103-106 ◽  
Author(s):  
S.I. Rao ◽  
E. Antillon ◽  
C. Woodward ◽  
B. Akdim ◽  
T.A. Parthasarathy ◽  
...  
Keyword(s):  
Interaction Model ◽  
Body Centered Cubic ◽  
Quaternary Alloys ◽  
Solution Hardening ◽  
Solute Interaction

Effects of milling and Ag doping on the fabrication of LaBa2Cu3Oy superconductor

1994 ◽  
Vol 9 (6) ◽  
pp. 1369-1375 ◽  
Author(s):  
Tsang-Tse Fang ◽  
Jao-Wei Huang ◽  
Ma-Shine Wu
Keyword(s):  
Grain Boundaries ◽  
Oxygen Content ◽  
High Temperatures ◽  
Single Phase ◽  
Densification Rate ◽  
Transition Width ◽  
High Quality ◽  
Ag Addition ◽  
Ag Doping ◽  
Long Time

The effects of milling and Ag addition on the decomposition of single-phase LaBa2Cu3Oy have been evaluated. It was found that the decomposition of milled single-phase LaBa2Cu3Oy powders when sintered in pure N2 is attributed to the introduction of strain in the lattice which causes the instability of the structure. The possible reasons why single-phase LaBa2Cu3Oy could be synthesized by sintering in pure N2 at high temperatures and its transition width is always broadened are proposed. The decomposition of compacts of unmilled powders of single-phase LaBa2Cu3Oy when sintered in pure N2 for a long time is due to the fact that oxygen diffuses along the grain boundaries and evolves through the surface of the specimens. Silver might segregate to the grain boundaries and prevent decomposition. It is suggested that to obtain a high-quality LaBa2Cu3Oy, sintering in the reduced atmosphere to achieve a proper oxygen content is required. Reduced atmosphere and Ag addition could enhance the densification rate. For Ag-doped specimens, Tc is highest for x = 0.0001, but decreases for x > 0.0001.

scholarly journals Design and development of a dual-phase TRIP-TWIP alloy for enhanced mechanical properties

2020 ◽  
Vol 321 ◽  
pp. 11014
Author(s):  
Lola Lilensten ◽  
Yolaine Danard ◽  
Fan Sun ◽  
Philippe Vermaut ◽  
Loïc Perrière ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Single Phase ◽  
Second Phase ◽  
Dual Phase ◽  
Body Centered Cubic ◽  
Transformation Induced Plasticity ◽  
Ti Alloys ◽  
Semi Empirical ◽  
Alloy Analysis

Triggering transformation induced plasticity (TRIP) and twinning induced plasticity (TWIP) mechanisms in metastable β titanium alloys (bcc, body centered cubic) have helped reaching unprecedented mechanical properties for Ti-alloys, including high ductility and work-hardening. Yet the yield strength of such alloys generally remains rather low. So far, mostly single-phase metastable bcc alloys have been developed. In this study, a dual phase TRIP/TWIP alloy is designed and investigated. While the β-matrix is expected to display TRIP/TWIP deformation mechanisms, the addition of a second phase, α in the present study, aims at increasing the yield strength. The composition was designed in the Ti-Cr-Sn system, based on Calphad prediction and on the semi-empirical d-electron alloy design approach. Results were compared to the published full β Ti – 8.5Cr – 1.5Sn (wt%) TRIP/TWIP alloy. The dual-phase alloy was prepared and processed to reach the desired microstructure containing about 20% α. It displays remarkable mechanical properties such as a ductility of 29%, an ultimate tensile strength of 1200 MPa and a yield strength of 760 MPa, 200MPa higher than the Reference single-phase β alloy. Analysis of the mechanical properties and deformation microstructures confirm the TRIP and TWIP effects, validating the proposed approach.

Lanthanide Based Ternary Intermetallics as Advanced Thermoelectric Materials

2006 ◽  
Vol 980 ◽  
Author(s):  
Ken Kurosaki ◽  
Takeyuki Sekimoto ◽  
Kenta Kawano ◽  
Hiroaki Muta ◽  
Shinsuke Yamanaka
Keyword(s):  
Electrical Resistivity ◽  
Seebeck Coefficient ◽  
High Temperatures ◽  
Thermoelectric Properties ◽  
Power Factor ◽  
Thermoelectric Materials ◽  
Room Temperature ◽  
Single Phase ◽  
Type Structure ◽  
Large Power

AbstractPolycrystalline ingots of the lanthanide based ternary intermetallics: LaNiSb, GdNiSb, ErNiSb and ErPdSb were prepared and characterized. The thermoelectric properties of ErNiSb and ErPdSb were measured at high temperatures. We succeeded in preparing the single phase ingots of ErNiSb and ErPdSb, while the ingots of LaNiSb and GdNiSb contain appreciable quantities of the impurity phases. ErNiSb and ErPdSb crystallize the MgAgAs-type structure (half-Heusler structure). ErNiSb and ErPdSb indicate positive values of the Seebeck coefficient. The values at room temperature are 36 and 240 micro VK-1 for ErNiSb and ErPdSb, respectively. The electrical resistivity of ErNiSb and ErPdSb decreases with temperature, indicating semiconductor-like behavior. ErPdSb exhibits a relatively large power factor 1.5x10-3 Wm-1K-2 at around 700 K, which is approximately two times larger than that of ErNiSb.

scholarly journals Mechanical Behavior of Molybdenum Disilicide-Based Alloys

2000 ◽  
Vol 646 ◽  
Author(s):  
A. Misra ◽  
A.A. Sharif ◽  
J. J. Petrovic ◽  
T. E. Mitchell
Keyword(s):  
Mechanical Behavior ◽  
Single Phase ◽  
Elevated Temperatures ◽  
Molybdenum Disilicide ◽  
Solution Hardening ◽  
Ambient Temperatures ◽  
Polycrystalline Alloys ◽  
Order Of Magnitude ◽  
Body Center ◽  
Magnitude Increase

ABSTRACTWe have investigated the mechanical behavior of the following single-phase polycrystalline alloys with the MoSi2 body-center tetragonal structure: MoSi2 alloyed with ∼2.5 at.% Re, MoSi2 alloyed with 2 at.% Al, MoSi2 alloyed with 1 at.% Nb, and MoSi2 alloyed with 1 at.% Re and 2 at.% Al. Several anomalies in the mechanical behavior of alloyed materials were observed. For example, (i) addition of only ∼2.5 at. % Re results in an order of magnitude increase in compressive strength at 1600 °C, (ii) additions of Nb and Al cause solution softening at near-ambient temperatures, and (iii) quaternary MoSi2-Re-Al alloys show strengthening at elevated temperatures and reduction in flow stress with enhanced plasticity at near-ambient temperatures in compression. The mechanisms of anomalous solution hardening and softening are discussed.

scholarly journals Synthesis of SiC nanowhiskers from graphite and silica by microwave heating

2016 ◽  
Vol 34 (4) ◽  
pp. 770-779 ◽  
Author(s):  
S.M. Kahar ◽  
C.H. Voon ◽  
C.C. Lee ◽  
U. Hashim ◽  
M.K. Md Arshad ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Heating Rate ◽  
Microwave Heating ◽  
High Temperatures ◽  
Single Phase ◽  
Raw Materials ◽  
Industrial Applications ◽  
Microwave Furnace ◽  
Ideal Composition

AbstractSilicon carbide (SiC) is an important ceramics for engineering and industrial applications due to its advantage to withstand in high temperatures. In this article, a demonstration of SiC nanowhiskers synthesis by using microwave heating has been shown. The mixtures of raw materials in the form of pellets were heated, using a laboratory microwave furnace, to 1400 °C for 40 minutes at a heating rate of 20 °C/min. The characterization process proved that the mixture of graphite and silica in the ratio of 1:3 is an ideal composition for synthesizing single phase β-SiC nanowhiskers. Vapor-solid mechanism was suggested to explain the formation of SiC nanowhiskers by the proposed microwave heating.

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