scholarly journals Synthesis of Bulk Nanostructured DO22Superlattice of Ni3(Mo, Nb) with High Strength, High Ductility, and High Thermal Stability

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
H. M. Tawancy
Keyword(s):  
Thermal Stability ◽  
Parent Phase ◽  
Aging Treatment ◽  
High Strength ◽  
Nanostructured Material ◽  
High Thermal Stability ◽  
Cubic Phase ◽  
Face Centered Cubic ◽  
High Ductility ◽  
Bulk Nanostructured Material

We show that a bulk nanostructured material combining high strength, high ductility, and high thermal stability can be synthesized in a Ni-Mo-Nb alloy with composition approaching Ni3(Mo, Nb). By means of a simple aging treatment at700°C, the grains of the parent face-centered cubic phase are made to transform into nanosized ordered crystals with DO22superlattice maintaining a size of 10–20 nm after up to 100 hours of aging and corresponding room-temperature yield strength of 820 MPa and tensile ductility of 35%. Deformation of the superlattice is found to predominantly occur by twinning on{111}planes of the parent phase. It is concluded that, although the respective slip systems are suppressed, most of the twinning systems are preserved in the DO22superlattice enhancing the ductility.

Thermal Stability and Failure Mechanisms of Au/Tiw(N)/Si and Au/TiW(N)/Si02/Si Systems

1996 ◽  
Vol 427 ◽  
Author(s):  
C. R. Chen ◽  
L. J. Chen
Keyword(s):  
Thermal Stability ◽  
Failure Mechanisms ◽  
Cubic Phase ◽  
Face Centered Cubic ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Single Face ◽  
Face Centered ◽  
The Stability ◽  
Ar Gas

AbstractThermal stability and failure mechanisms of Au/TiW(N)/Si and Au/TiW(N)/SiO2/Si systems have been studied by both conventional and high-resolution transmission electron microscopy, X- ray diffraction and Auger electron spectroscopy. For films deposited in Ar gas containing 20% N2, a single face-centered-cubic phase was the only crystalline phase detected to form. The samples were found to remain stable after annealing at 700 °C for 30 min. The stability temperature for Au/TiW(N)(Ar:N2=80:20)/SiO2/Si samples was found to be higher than those of Au/TiW(N) (Ar:N2=90:10)/SiO2/Si and Au/TiW/SiO2/Si samples.

Long-Range Ordering: An Approach to Synthesize Nanoscale Ni-Mo-Based Superlattices with High Strength and High Ductility

2009 ◽  
Vol 633-634 ◽  
pp. 421-435 ◽  
Author(s):  
H.M. Tawancy
Keyword(s):  
Long Range ◽  
Tensile Elongation ◽  
Aging Treatment ◽  
High Strength ◽  
Alloy System ◽  
Chemical Compositions ◽  
Atomic Order ◽  
High Ductility ◽  
The Matrix ◽  
Long Range Ordering

It is shown that long-range ordering in certain alloys based upon the Ni-Mo system can provide a viable means for synthesizing bulk nanoscale materials combing high strength and high ductility. Three alloys were included in the study with nominal chemical compositions of Ni-27Mo, Ni-27Mo-0.03B, and Ni-27Mo-12Cr all in weight %. Ordering was induced by thermal aging at 700 oC resulting in a D1a superlattice (Ni4Mo) in the Ni-27Mo and Ni-27Mo-0.03B alloys, and a Pt2Mo-type superlattice [Ni2(Cr,Mo)] in the Ni-27Mo-12Cr alloy. During the early stages of aging, atomic order in the Ni-27Mo alloy was completed homogeneously in the matrix resulting in a nanoscale superlattice with high strength and high ductility, however, a considerable loss of ductility occurred after extended aging. The results suggested that this behavior was not related to the degree of atomic order but rather to a change in morphology resulting from a heterogeneous ordering reaction at grain boundaries promoted by strain-induced recrystallization. Although a nanoscale superlattice combining high strength and high ductility could be synthesized in the Ni-27Mo alloy by proper aging treatment, it is demonstrated that the heterogeneous ordering reaction could be suppressed by the addition of boron or chromium to improve the thermal stability of the alloy system. On the average, a combination of about 800 MPa yield strength and 40% tensile elongation at room temperature could be achieved in the alloys studied. Deformation in the ordered state is found to occur by twinning, which has been related to the crystallography of the disorder-order transformation.

scholarly journals Core-shell structured titanium-nitrogen alloys with high strength, high thermal stability and good plasticity

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Y. S. Zhang ◽  
Y. H. Zhao ◽  
W. Zhang ◽  
J. W. Lu ◽  
J. J. Hu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Strength ◽  
High Thermal Stability ◽  
Core Shell

High strength CoFe-based glassy alloy with high thermal stability

2014 ◽  
Vol 114 ◽  
pp. 126-128 ◽  
Author(s):  
Jian Qiang ◽  
Diana Estevez ◽  
Chuntao Chang ◽  
Qikui Man ◽  
Run-Wei Li ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Glassy Alloy ◽  
High Strength ◽  
High Thermal Stability

Microstructure and Properties of Ultrafine Grained Cu-0.73%Cr Alloy after High Pressure Torsion

2011 ◽  
Vol 391-392 ◽  
pp. 385-389 ◽  
Author(s):  
Kun Xia Wei ◽  
Wei Wei ◽  
Igor V. Alexandrov ◽  
Qing Bo Du ◽  
Jing Hu
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Electrical Conductivity ◽  
Grain Size ◽  
High Pressure ◽  
High Pressure Torsion ◽  
Aging Treatment ◽  
High Thermal Stability ◽  
Subsequent Aging ◽  
Ultrafine Grained

Microstructure, mechanical properties and electrical conductivity in Cu-0.73%Cr alloy after HPT process and the subsequent aging treatment have been investigated. Ultrafine grained structure with the grain size ~150 nm has been achieved after the HPT and the subsequent aging treatment. Ultrafine grains with some growth twins were preserved in the overaged state, showing high thermal stability. The peak microhardness and tensile strength of Cu-0.73%Cr alloy after the HPT was found at 480 °C for 2 hours. Electrical conductivity shows an increase trend in the different aging states.

Microstructure of resistance spot welding of maraging steels

1990 ◽  
Vol 48 (4) ◽  
pp. 900-901
Author(s):  
I. Neuman ◽  
S.F. Dirnfeld ◽  
I. Minkoff
Keyword(s):  
Maraging Steel ◽  
Spot Welding ◽  
Lath Martensite ◽  
Base Material ◽  
Aging Treatment ◽  
High Strength ◽  
Maraging Steels ◽  
Heat Treated ◽  
Current Cycle ◽  
Welding Processes

Experimental work on the spot welding of Maraging Steels revealed a surprisingly low level of strength - both in the as welded and in aged conditions. This appeared unusual since in the welding of these materials by other welding processes (TIG,MIG) the strength level is almost that of the base material. The maraging steel C250 investigated had the composition: 18wt%Ni, 8wt%Co, 5wt%Mo and additions of Al and Ti. It has a nominal tensile strength of 250 KSI. The heat treated structure of maraging steel is lath martensite the final high strength is reached by aging treatment at 485°C for 3-4 hours. During the aging process precipitation takes place of Ni3Mo and Ni3Ti and an ordered solid solution containing Co is formed.Three types of spot welding cycles were investigated: multi-pulse current cycle, bi-pulse cycle and single pulsle cycle. TIG welded samples were also tested for comparison.The microstructure investigations were carried out by SEM and EDS as well as by fractography. For multicycle spot welded maraging C250 (without aging), the dendrites start from the fusion line towards the nugget centre with an epitaxial growth region of various widths, as seen in Figure 1.

DUCTALLOY

Alloy Digest ◽  
1956 ◽  
Vol 5 (6) ◽  
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Physical Properties ◽  
High Strength ◽  
Heat Treating ◽  
High Ductility ◽  
High Carbon ◽  
Brake Shoe ◽  
Temperature Performance ◽  
Ferrous Material

Abstract DUCTALLOY is a high-carbon ferrous material having high strength, high ductility, toughness and machinability. It is supplied in three grades: pearlitic grade 80, ferritic grade 60, and austenitic grade A50. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on high temperature performance as well as heat treating, machining, and joining. Filing Code: CI-14. Producer or source: American Brake Shoe Company.

COPPER ALLOY No. 165

Alloy Digest ◽  
1977 ◽  
Vol 26 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
High Strength ◽  
Heat Treating ◽  
High Ductility ◽  
Electrical Conductor ◽  
Annealed Condition ◽  
Low Strength

Abstract Copper Alloy No. 165 is a copper-cadmium-tin alloy with low strength and high ductility in the annealed condition. In the hard-drawn condition, characterized by high strength and low ductility, it is used widely as an electrical conductor. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-327. Producer or source: Copper and copper alloy mills.

IN-102

Alloy Digest ◽  
1969 ◽  
Vol 18 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Elevated Temperatures ◽  
Iron Alloy ◽  
High Strength ◽  
Heat Treating ◽  
High Ductility ◽  
International Nickel Company ◽  
Nickel Chromium ◽  
Temperature Performance ◽  
High Degree

Abstract IN-102 is a nickel-chromium-iron alloy designed for long service at temperatures up to 1300 F. It combines high strength and high ductility at the elevated temperatures with a high degree of structural stability. It is used for aerospace, power and steam turbine components. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-147. Producer or source: International Nickel Company Inc..

Sign in / Sign up

Export Citation Format

Share Document