scholarly journals Effect of Re on the Microstructure and Mechanical Properties of NbTiZr and TaTiZr Equiatomic Alloys

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1819
Author(s):  
Oleg N. Senkov ◽  
Stéphane Gorsse ◽  
Robert Wheeler ◽  
Eric J. Payton ◽  
Daniel B. Miracle
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Yield Stress ◽  
Volume Fraction ◽  
True Strain ◽  
Matrix Phase ◽  
Vacuum Arc ◽  
Strengthening Effect ◽  
Arc Melting ◽  
Vacuum Arc Melting

The microstructure, phase composition, and mechanical properties of NbTiZr, TaTiZr, Re0.3NbTiZr, and Re0.3TaTiZr are reported. The alloys were produced by vacuum arc melting and hot isostatically pressed (HIP’d) at 1400 °C for 3 h under 276 MPa hydrostatic pressure of high-purity argon prior to testing. NbTiZr had a single-phase BCC crystal structure, while TaTiZr had a Ti- and Zr-rich BCC matrix phase and Ta-rich nanometer-sized BCC precipitates, at volume fractions of 0.49 and 0.51, respectively. Re0.3NbTiZr consisted of a BCC matrix phase and Re-rich precipitates with a FCC crystal structure and the volume fraction of 0.14. The microstructure of Re0.3TaTiZr consisted of a Zr-rich BCC matrix phase and coarse, Re and Ta rich, BCC particles, which volume fraction was 0.47. NbTiZr and TaTiZr had a room temperature (RT) yield stress of 920 MPa and 1670 MPa, respectively. While, 10 at.% Re additions increased the RT yield stress to 1220 MPa in Re0.3NbTiZr and 1715 MPa in Re0.3TaTiZr. Re also considerably improved the RT ductility of TaTiZr, from about 2.5% to 10% of true strain. The positive strengthening effect from the Re additions was retained at high (800–1200 °C) temperatures.

Microstructure and Mechanical Properties of VTaTiMoAlx Refractory High Entropy Alloys

2017 ◽  
Vol 898 ◽  
pp. 638-642 ◽  
Author(s):  
Dong Xu Qiao ◽  
Hui Jiang ◽  
Xiao Xue Chang ◽  
Yi Ping Lu ◽  
Ting Ju Li
Keyword(s):  
Mechanical Properties ◽  
Vacuum Arc ◽  
High Entropy Alloys ◽  
X Ray Diffraction ◽  
Dendrite Structure ◽  
X Ray ◽  
High Entropy ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Microstructure And Mechanical Properties

A series of refractory high-entropy alloys VTaTiMoAlx with x=0,0.2,0.6,1.0 were designed and produced by vacuum arc melting. The effect of added Al elements on the microstructure and mechanical properties of refractory high-entropy alloys were investigated. The X-ray diffraction results showed that all the high-entropy alloys consist of simple BCC solid solution. SEM indicated that the microstructure of VTaTiMoAlx changes from equiaxial dendritic-like structure to typical dendrite structure with the addition of Al element. The composition of different regions in the alloys are obtained by energy dispersive spectroscopy and shows that Ta, Mo elements are enriched in the dendrite areas, and Al, Ti, V are enriched in inter-dendrite areas. The yield strength and compress strain reach maximum (σ0.2=1221MPa, ε=9.91%) at x=0, and decrease with the addition of Al element at room temperature. Vickers hardness of the alloys improves as the Al addition.

The effect of 0.3 wt% oxygen on mechanical properties of a TiZrAl alloy prepared by vacuum arc melting

Vacuum ◽  
2020 ◽  
Vol 175 ◽  
pp. 109248 ◽  
Author(s):  
X.J. Jiang ◽  
Y.Y. Zhang ◽  
N. Yang ◽  
S.Q. Wang ◽  
Q.X. Ran
Keyword(s):  
Mechanical Properties ◽  
Vacuum Arc ◽  
Arc Melting ◽  
Vacuum Arc Melting

Microstructure, Mechanical Properties and Wear Resistance of Fe-Al Based Alloys with Various Alloying Elements

2004 ◽  
Vol 842 ◽  
Author(s):  
Han-Sol Kim ◽  
In-Dong Yeo ◽  
Tae-Yeub Ra ◽  
Won-Yong Kim
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Alloying Elements ◽  
Vacuum Arc ◽  
High Temperature Region ◽  
X Ray ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Zr Addition ◽  
Dendritic Structures

ABSTRACTWe report on microstructure, mechanical properties and wear resistance of Fe-Al based alloys with various alloying elements. The microstructures were examined using optical and scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscope (EDS). Two types of alloys were prepared using vacuum arc melting; one is Fe-28Al based alloys (D03 structured) with and without alloying elements such as Mo and Zr. The other one is Fe-35Al based alloys (B2 structured) produced with same manner. For both types of alloys, equiaxed microstructures were observed by the addition of Mo, while dendritic structures were observed by the Zr addition. These microstructural features were more evinced with increasing the content of alloying elements. Concerning the mechanical properties and wear resistance, Fe-35Al based alloys with or without Mo addition superior to Fe-28Al based alloys especially in the high temperature region.

Effect of Mo and Ni Content on the Mechanical Properties of Low Carbon and Alloy Steel Casting Sample for Coal-Mining Machinery

2012 ◽  
Vol 476-478 ◽  
pp. 329-333
Author(s):  
Zhi Ying Ma ◽  
Yi Tao Yang
Keyword(s):  
Mechanical Properties ◽  
Melting Furnace ◽  
Vacuum Arc ◽  
Low Carbon ◽  
Alloy Casting ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Ni Content ◽  
Mining Machinery ◽  
Casting Steel

The effect of Mo and Ni content on the mechanical properties of low carbon and alloy casting steel by using Vacuum Arc Melting Furnace had been studied in this paper. The results indicated that increasing Mo or Ni content would enhance the hardness and strength of the steel separately, with some of elongation loss. It showed that ferrite refined with the increasing alloy content. The combinations of Mo and Ni content were of importance for comprehensive mechanical properties and wear resistance. The appropriate content in low carbon casting steel with 0.02%Nb was 0.5%-0.6%Mo and 0.2%-0.4%Ni.

Mechanical Behavior of Novel Suction Cast Ti-Cu-Fe-Co-Ni High Entropy Alloys

2014 ◽  
Vol 790-791 ◽  
pp. 503-508 ◽  
Author(s):  
Sumanta Samal ◽  
Sutanuka Mohanty ◽  
Ajit Kumar Misra ◽  
Krishanu Biswas ◽  
B. Govind
Keyword(s):  
Mechanical Properties ◽  
Vacuum Arc ◽  
High Entropy Alloys ◽  
The Novel ◽  
Electron Microscopic ◽  
High Entropy ◽  
Alloy Chemistry ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Ductile Mode

The present investigation reports mechanical properties of novel multicomponent TixCuyFe20Co20Ni20 high entropy alloys (HEAs) with different alloy chemistry (x/y = 1/3, 3/7, 3/5, 9/11, 1, 11/9 and 3/2). The alloy cylinders were prepared by vacuum arc melting-cum-suction casting route. The detailed electron microscopic observations reveal the presence of three different solid solution phases; FCC (a1) phase, FCC (a2) phase and BCC (b) phase for all the investigated alloys, whereas ultrafine eutectic between FCC (a1) phase, and Ti2 (Co, Ni) - type Laves phase has been observed for the HEAs with x/y = 9/11, 1, 11/9 and 3/2. Room temperature compression test of the suction cast cylinders with aspect ratio of 2/1 has been conducted to obtain mechanical properties of the HEAs. The optimum combination of strength (~ 1.88 GPa) and plasticity (~ 21 %) is obtained for x/y = 9/11; indicating simultaneous improvement of strength as well as plasticity of the novel HEAs. Fractographic analysis of the fractured surfaces reveals mixed mode of fracture for x/y = 1/3, 3/7 and 3/5, ductile mode for x/y = 9/11 and 1, whereas brittle mode of fracture for x/y = 11/9 and 3/2.

A Study of Quaternary Cr-Cr2Ta Alloys - Microstructure and Mechanical Properties

2013 ◽  
Vol 1516 ◽  
pp. 275-281 ◽  
Author(s):  
Varun Choda ◽  
Ayan Bhowmik ◽  
Ian M. Edmonds ◽  
C. Neil Jones ◽  
Howard J. Stone
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Eutectic Mixture ◽  
Melting Process ◽  
Laves Phase ◽  
Vacuum Arc ◽  
Micro Scale ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Atomic Radii

ABSTRACTSix alloys based on Cr-10Ta-7Si (by at.%) with quaternary additions of 0.5Ag, 5Ti, 1Hf, 3Mo, 3Al, or 3Re (by at.%) substituted for Cr were produced by vacuum arc-melting. The microstructures of the alloys were found to predominantly consist of a eutectic mixture of an A2 Cr-based solid solution and a C14 Cr2Ta Laves phase along with proeutectic Cr2Ta dendrites. Microstructural macro- and micro-scale inhomogeneities were observed in all alloy ingots, which were attributed to the non-equilibrium arc-melting process. The measured lattice parameters of the constituent phases and the elemental partitioning behaviour between the phases have been correlated with the respective covalent atomic radii. The bulk hardnesses of the alloys, along with the hardness of individual phases, have also been reported.

Fabrication and Properties of TiB2 Reinforced Cu Composites by Electromagnetic Stirring

2004 ◽  
Vol 449-452 ◽  
pp. 297-300 ◽  
Author(s):  
Taek Kyun Jung ◽  
Sung Chul Lim ◽  
Hyouk Chon Kwon ◽  
Mok Soon Kim
Keyword(s):  
Annealing Temperature ◽  
Volume Fraction ◽  
Melting Furnace ◽  
Electromagnetic Stirring ◽  
Vacuum Arc ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Copper Melt ◽  
Mean Size ◽  
The Mean

Cu-Ti and Cu-B alloys were separately cast in vacuum arc melting furnace for alloying. These alloys were added to the copper melt of 1500K in the induction furnace and performed electromagnetic stirring at 1000rpm. The cast ingot(dia : 70mm, length : 100mm) was hot extruded with the extrusion ratio of 13:1 after heating at 1073K for 1 hour. The TiB 2 precipitates were observed in the extruded materials and the mean size of TiB 2 precipitates was found to be about 1.5µm. The volume fraction of TiB 2 varies due to the density difference between the TiB2 and the copper melt. With the increasing of TiB2 contents from 3 to 8 vol.%, the hardness and the tensile strength increased from 951 to 140Hv and from 248 to 278MPa, respectively, and the electrical conductivity decreased from 82 to 70%IACS. However, the mean size of TiB 2 particle was not increased despite increasing an annealing temperature.

Microstructure and Compressive Properties of Fe-Modified L12-TYPE Al3Ti

1990 ◽  
Vol 186 ◽  
Author(s):  
H.R. Pak ◽  
C.M. Wayman ◽  
L.H. Favrow ◽  
C.V. Cooper ◽  
J.S.L. Pak
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Yield Stress ◽  
Single Phase ◽  
Small Volume ◽  
Volume Fraction ◽  
Small Region ◽  
Compressive Properties ◽  
Small Volume Fraction

AbstractThe microstructures and mechanical properties of an Fe-modified L12 alloy containing 7.5 at.% Fe have been investigated. This alloy has been determined to be essentially single phase following a homogenization heat treatment (HHT) at 1100°C for 100h, with a very small volume fraction of precipitates having been observed to form along dislocations. Conversely, in the case of the as-cast (AC) condition, the alloy has been determined to contain band-like precipitates, which have also formed along dislocations. In addition, a high density of very thin plate-like precipitates have formed parallel to {001} planes of the L12 matrix. Although these plate-like precipitates appear to exhibit lattice tetragonality, their crystal structure cannot be explained by assuming D022 and D023 structures. Five different <110>-type dislocations havfe been activated within a small region of a matrix grain during deformation at 1100°C, some of which cross slipped from {111} to {001} planes. Specimens in both AC and HHT conditions were deformed in compression to approximately 0.5% without fracture at both 22 and 1 100°C, the yield stress for the HIT condition having been determined to be 192 MPa at 22°C and 98 MPa at 1100°C.

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