The Effect of Tungsten on the Mechanical Properties of Tantalum

1999 ◽  
Vol 121 (2) ◽  
pp. 172-177 ◽  
Author(s):  
C. L. Briant ◽  
D. H. Lassila
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Yield Strength ◽  
Mechanical Behavior ◽  
Work Hardening ◽  
Solid Solution Hardening ◽  
Solution Hardening

This paper reports a study of the mechanical behavior of Ta-W alloys. The results show that tungsten additions increase the yield strength and the rate of work hardening of tantalum. These additions also cause a change in the deformed microstructure from one that is primarily cellular to one that consists mostly of dislocation tangles. It is proposed that the increase in yield strength arises from solid solution hardening and that the increase in the work hardening can be correlated with an increase in the density and arrangement of dislocations present in the material.

scholarly journals Microstructure and mechanical properties of high-manganese-containing high-speed twin-roll cast Al-Mn-Si alloy strips and their cold-rolled sheets

2020 ◽  
Vol 326 ◽  
pp. 06004
Author(s):  
T.Ha Nguyen ◽  
Ram Song ◽  
Yohei Harada ◽  
Shinji Muraishi ◽  
Shinji Kumai ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
High Speed ◽  
Solid Solution Hardening ◽  
Columnar Dendrite ◽  
Dispersion Hardening ◽  
High Manganese ◽  
Solution Hardening ◽  
Cold Rolled ◽  
Twin Roll

Al-Mn based alloys with high-manganese content are expected to have improved mechanical properties due to solid solution hardening and/or dispersion hardening. However, the increase of Mn solubility of the alloy is difficult by using the conventional DC casting. In order to solve this problem, in the present study, we focused on the twin-roll casting method which is characterized by high cooling rates. Several kinds of high Mn-containing Al-Mn-Si alloy strips were fabricated by using a vertical-type high-speed twin-roll caster equipped with a pair of water-cooled copper rolls. Direct temperature measurement of the liquid melt during the casting was also performed. The alloy strips of various compositions containing up to 4 Mn and 2 Si (wt%) were successfully obtained. By observing the microstructure of the cross section of the strip, we found the characteristic solidified structure. The solidified structure consisted of three layers. Two solidified shells with a columnar dendrite structure grew from the roll surfaces toward the strip center. In the mid-thickness region, the band structure consisting of equiaxed dendrites and globular grains was observed between the solidified shells. Very fine primary particles were observed in the matrix near the strip surface, while, relatively coarse particles with blocky and needle-like shape were observed in the central band of the as-cast strip. The electric conductivity measurement was performed for the as-cast strips. Mn solubility in Al matrix was estimated from the obtained values. The estimated Mn solubility in the Al-2Mn-xSi strips was between 1.5 ~ 1.8wt% Mn. It was over 1.43wt%Mn for the Al-4Mn-xSi strips. We found that the Mn solubility of the as-cast strips was considerably high. The strips were cold-rolled to the sheets and then annealed at various conditions. They were subjected to the tensile tests, and the effects of solid solution hardening and dispersion hardening are discussed.

Preparation, Structure and Mechanical Properties of RuAl and (Ru,Ni)Al Alloys

1996 ◽  
Vol 460 ◽  
Author(s):  
A. L. R. Sabariz ◽  
G. Taylor
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Room Temperature ◽  
Binary Compound ◽  
Lattice Parameter ◽  
Al Alloys ◽  
Solid Solution Hardening ◽  
Solution Hardening ◽  
Cscl Type ◽  
The Difference

ABSTRACTThe intermetallic compound, RuAl with B2 CsCl type structure, has been shown to possess room-temperature toughness and plasticity. NiAl also forms a B2 compound and it is claimed that a pseudo-binary compound, (Ru,Ni)Al, may be formed because the difference in lattice parameter between the two binary phases is slight. In this work a study has been made of the mechanical properties of some polycrystalline compounds, across the RuAl-(Ru,Ni)Al pseudo-binary, prepared from high-purity elemental powders. Compressive yield stresses were measured between room-temperature and 900°C, and the mechanisms of plastic flow are discussed in relation to the dislocation structures observed by TEM. Hot-microhardness tests were made to provide an indication of the effect of solid-solution hardening.

scholarly journals Solid solution hardening in CrMnFeCoNi-based high entropy alloy systems studied by a combinatorial approach

2021 ◽  
Author(s):  
Tom Keil ◽  
Daniel Utt ◽  
Enrico Bruder ◽  
Alexander Stukowski ◽  
Karsten Albe ◽  
...  
Keyword(s):  
Solid Solution ◽  
Yield Strength ◽  
Strain Hardening ◽  
Solid Solution Hardening ◽  
High Entropy Alloy ◽  
Solution Hardening ◽  
Local Composition ◽  
High Entropy ◽  
Dependent Strain ◽  
Local Shear

Abstract Solid solution hardening in high entropy alloys was studied for the Cantor alloy using diffusion couples and nanoindentation. We study a continuous variation of the alloying content and directly correlate the nanoindentation hardness to the local composition up to the phase boundary. The composition dependent hardness is analysed using the Labusch model and the more recent Varvenne model. The Labusch model has been fitted to experimental data and confirms Cr as the most potent strengthening element. For comparison of the experimental hardness and the predicted yield strength of the Varvenne model, a concentration-dependent strain-hardening factor is introduced to account for strain hardening during indentation, which leads to a very good agreement between experiment and model. A study of the input parameters of the Varvenne model, performed by atomistic computer simulations, shows no significant effect of fluctuations in the atomic size misfit volumes or in the local shear modulus to the computed yield strength. Graphic Abstract

Effects of Annealing Temperature and Si Content on Mechanical Properties of Cold Drawn Pearlitic Steel Wires

2007 ◽  
Vol 345-346 ◽  
pp. 65-68
Author(s):  
Dae Bum Park ◽  
Won Jong Nam
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Silicon Content ◽  
Annealing Temperature ◽  
Pearlitic Steel ◽  
Age Hardening ◽  
Solid Solution Hardening ◽  
Solution Hardening ◽  
Steel Wires ◽  
Si Content

The effects of annealing temperature and silicon content on mechanical properties on cold drawn pearlitic steel wires were investigated. Cold drawn steel wires, containing Si, 0.99 ~ 1.4%, were annealed at the temperature of 200 ~ 450°C with different annealing time. The variation of microstructural evolution with annealing temperature was not affected by silicon content. For steels containing high silicon content above 1.0%, the increase of silicon content did not cause the changes of peak temperature showing age hardening and age softening, except for the increase of tensile strength due to solid solution hardening.

Effects of Alloying Elements on Mechanical Properties in Hyper-Eutectoid Steel Wires

2010 ◽  
Vol 654-656 ◽  
pp. 318-321 ◽  
Author(s):  
Jung Won Lee ◽  
Ui Gu Kang ◽  
Yong Sin Lee ◽  
Kyung Tae Park ◽  
Won Jong Nam
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Silicon Content ◽  
Annealing Temperature ◽  
Pearlitic Steel ◽  
Age Hardening ◽  
Solid Solution Hardening ◽  
Eutectoid Steel ◽  
Solution Hardening ◽  
Steel Wires

The effects of annealing temperature and silicon content on mechanical properties on cold drawn pearlitic steel wires were investigated. Cold drawn steel wires, containing Si, 0.99 ~ 1.4%, were annealed at the temperature of 200 ~ 450°C with different annealing time. The variation of microstructural evolution with annealing temperature was not affected by silicon content. For steels containing high silicon content above 1.0%, the increase of silicon content did not cause the changes of peak temperature showing age hardening and age softening, except for the increase of tensile strength due to solid solution hardening.

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