Microstructure and Tensile Properties of Oxide Dispersion Strengthened Molybdenum Alloys Prepared by Different Doping Process

2007 ◽  
Vol 353-358 ◽  
pp. 481-484 ◽  
Author(s):  
Yuan Jun Sun ◽  
Guo Jun Zhang ◽  
Chao Zuo ◽  
Jian Feng Wei ◽  
Jun Sun
Keyword(s):  
Aqueous Solutions ◽  
Tensile Properties ◽  
High Strength ◽  
Oxide Dispersion Strengthened ◽  
Strengthening Mechanism ◽  
Solid Particles ◽  
Mechanism Analysis ◽  
Dispersion Strengthening ◽  
Fine Grain ◽  
Molybdenum Alloys

The oxide lanthanum dispersion strengthened molybdenum alloys were prepared by proprietary powder metallurgy technology, in which the Mo-La2O3 powders were prepared by liquid-liquid doping process which the oxide lanthanum was added to ammonium bi-molybdate solutions as aqueous solutions of La(NO3)3 and liquid-solid doping process which the oxide lanthanum was added to molybdenum oxide solid particles as aqueous solutions of La(NO3)3, respectively. The microstructure and tensile properties of the molybdenum alloys were investigated at room temperature. The results show that the molybdenum alloys all have fine molybdenum grains, and the molybdenum alloy prepared by liquid-solid doping process mainly contain fine oxide lanthanum particles of submicron and nano-sized while the alloy prepared by liquid-liquid doping process mainly contain nano-sized fine oxide lanthanum particles. The molybdenum alloys prepared by liquid-liquid doping process have higher yield strength and ductility than yield-solid doping process. The results of strengthen mechanism analysis show that the high strength of the molybdenum alloys can be advisablely explained by the fine grain strengthening and particles dispersion strengthening mechanism through the Hall–Petch relationship and Orowan model.

scholarly journals Microstructure and Enhanced Properties of Copper-Vanadium Nanocomposites Obtained by Powder Metallurgy

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 339 ◽  
Author(s):  
Yong Wang ◽  
Jinguo Wang ◽  
Haohao Zou ◽  
Yutong Wang ◽  
Xu Ran
Keyword(s):  
Electrical Conductivity ◽  
Grain Size ◽  
Yield Strength ◽  
Grain Boundary ◽  
High Strength ◽  
Strengthening Mechanism ◽  
Copper Matrix ◽  
Dispersion Strengthening ◽  
Annealed Copper ◽  
Grain Boundary Strengthening

Cu-2.4 wt.%V nanocomposite has been prepared by mechanical alloy and vacuum hot-pressed sintering technology. The composites were sintered at 800 °C, 850 °C, 900 °C, and 950 °C respectively. The microstructure and properties of composites were investigated. The results show that the Cu-2.4 wt.%V composite presents high strength and high electrical conductivity. The composite sintered at 900 °C has a microhardness of 205 HV, a yield strength of 404.41 MPa, and an electrical conductivity of 79.5% International Annealed Copper Standard (IACS); the microhardness and yield strength reduce gradually with the increasing consolidation temperature, which is mainly due to the growth of copper grain size. After sintering, copper grain size and V nanoparticle both maintain in nanoscale; the strengthening mechanism is related to grain boundary strengthening and dispersion strengthening, while the grain boundary strengthening mechanism plays the most important role. This study indicates that the addition of small amounts of V element could enhance the copper matrix markedly with the little sacrifice of electrical conductivity.

ECLIPSALOY 520

Alloy Digest ◽  
1961 ◽  
Vol 10 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Compressive Strength ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Casting Alloy ◽  
Fine Grain

Abstract ECLIPSALOY 520 is a fine-grain magnesium sand casting alloy containing zinc and zirconium. It is recommended where high strength is required. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness. It also includes information on corrosion resistance as well as heat treating, machining, joining, and surface treatment. Filing Code: Mg-50. Producer or source: Bendix Aviation Corporation.

Microstructure and Mechanical Properties of Molybdenum Alloys Doped with ZrB2 Particles

2010 ◽  
Vol 160-162 ◽  
pp. 1828-1833 ◽  
Author(s):  
Guo Jun Zhang ◽  
Jun Zhuo ◽  
Shu Ai Ren
Keyword(s):  
Mechanical Properties ◽  
Mass Fraction ◽  
Zirconium Diboride ◽  
Particle Dispersion ◽  
Dispersion Strengthening ◽  
Pure Molybdenum ◽  
Grain Sizes ◽  
Fine Grain ◽  
Fine Grain Strengthening ◽  
Molybdenum Alloys

The molybdenum alloys doped with various mass fraction zirconium diboride (ZrB2) particles were successfully prepared by using the powder metallurgy technology. The microstructure, hardness and the tensile properties of the pure molybdenum and molybdenum alloys doped with ZrB2 particles were determined at room temperature. Results showed that the addition of zirconium diboride refined the molybdenum grains obviously, meanwhile, molybdenum grain sizes decrease with the increasing of zirconium diboride mass fraction. Measurements on mechanical properties showed that molybdenum alloys doped with ZrB2 particles had higher hardness and strength than pure molybdenum. The analysis and discussion results show that the strengthening mechanisms of ZrB2-doped molybdenum alloys may be attributed to the fine-grain strengthening, particle dispersion strengthening, interfacial-bond strengthening and oxygen reduction strengthening.

Microstructure Analysis of TiC Reinforced Fe-Based Composite Coating by Plasma Cladding

2012 ◽  
Vol 472-475 ◽  
pp. 297-301
Author(s):  
Jin Bin Lu ◽  
Pu Meng ◽  
Feng Tang ◽  
Jin Xia Gong ◽  
Bin Zhao
Keyword(s):  
Composite Coating ◽  
Strengthening Mechanism ◽  
Eutectic Structure ◽  
Dispersion Strengthening ◽  
Solid Solution Strengthening ◽  
Fine Grain ◽  
Fine Grain Strengthening ◽  
Plasma Cladding ◽  
Tic Particle ◽  
Hardness Increase

TiC reinforced Fe-based composite coating with 10% and 20% TiC particle were prepared on the surface of substrate Q235 steel by plasma cladding, respectively. The microstructure and formation mechanism of cladding layer were carefully investigated by SEM, EDS and XRD. The results show that metallurgical combination is achieved between coating and substrate, the microstructure of composite coating is composed of dendrite α-Fe, interdendritic eutectic structure (α-Fe, Cr23C6 and CrB) and added TiC particles, and microstructure refinement with the increase of TiC particles content. TiC particles react with Fe-based alloy and part of TiC particles dissolve into coating. The hardness of composite coating has a relationship with TiC particles content and TiC particles distribution, and hardness increase with the increase of TiC particles content. The maximum value of composite coating hardness is 545 HV0.2 and 719 HV0.2, respectively. The major strengthening mechanism is fine-grain strengthening, solid solution strengthening and dispersion strengthening.

Development of Micro-Alloying Ultra-Fine Grain High Strength Steel Produced by EAF-TSCR

2011 ◽  
Vol 697-698 ◽  
pp. 474-478
Author(s):  
Ji Xiang Gao ◽  
Xin Ping Mao ◽  
L.J. Li
Keyword(s):  
Grain Size ◽  
Yield Strength ◽  
Continuous Casting ◽  
High Strength Steel ◽  
Raw Materials ◽  
High Strength ◽  
Strengthening Mechanism ◽  
Fine Grain ◽  
Ferrite Grain Size

Based on the characteristics of raw materials in EAF-TSCR, the composition of VN micro-alloyed was designed, the processes of the steelmaking, continuous casting, soaking, rolling, cooling were controlled, and at last the VN Micro-alloying high strength steel with ultra-fine grain was developed. The ferrite grain size of the steel reaches 3.0 to 4.0 microns, and the yield strength of which reaches 550MPa. Besides, the steel processes good toughness, cold formability and weldability. In the end, the strengthening mechanism of the ultra-fine steel was discussed.

INCONEL ALLOY 725

Alloy Digest ◽  
1994 ◽  
Vol 43 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Inconel Alloy ◽  
Alloy 625

Abstract INCONEL ALLOY 725 is an age-hardenable alloy that displays high strength along with excellent ductility and toughness. Its corrosion resistance is comparable to alloy 625. Good flattening properties are exhibited in age-hardened tubing. This datasheet provides information on composition, physical properties, hardness, tensile properties, and shear strength as well as fracture toughness. It also includes information on corrosion resistance as well as heat treating and machining. Filing Code: Ni-445. Producer or source: Inco Alloys International Inc.

PYROTOOL A

Alloy Digest ◽  
1971 ◽  
Vol 20 (4) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Good Ductility ◽  
Extrusion Dies ◽  
Temperature Performance

Abstract PYROTOOL A has been designed to display high strength and good ductility at temperatures up to 1200 F. It is used for high-temperature tooling, extrusion dies, liners, dummy blocks, forging dies, mandrels, holders, etc. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Fe-47. Producer or source: Carpenter.

BERYLCO 25

Alloy Digest ◽  
1973 ◽  
Vol 22 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
High Performance ◽  
High Strength ◽  
Heat Treating ◽  
Beryllium Copper

Abstract BERYLCO 25 is the standard high-performance beryllium copper alloy most widely used because of its high strength, hardness and excellent spring characteristics. BERYLCO 25 is the updated version of BERYLCO 25S (Alloy Digest Cu-3, November 1952). This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-271. Producer or source: Kawecki Berylco Industries Inc..

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