Strengthening Mechanisms and Tribological Properties of Ultra-Hard AlMgB14 Based Composite Reinforced with TiB2

2020 ◽  
Vol 12 (6) ◽  
pp. 866-872
Author(s):  
Wen Liu ◽  
Chun-Yan Hao ◽  
Xu-Dong Zhao ◽  
Xiang-Jun Wang ◽  
Guo-Liang Shi
Keyword(s):  
Fracture Toughness ◽  
Friction And Wear ◽  
Room Temperature ◽  
High Strength ◽  
Strengthening Mechanisms ◽  
Interface Bonding ◽  
Dispersion Strengthening ◽  
Hard Phase ◽  
Phase Dispersion ◽  
Relative Hardness

AlMgB14–TiB2 composites with ideal structures are successfully prepared by field activated and pressure assisted synthesis. The effects of different TiB2 contents on the relative hardness and toughness of the composites were investigated. The results showed adding TiB2 could both increase the hardness of AlMgB14 and improve the fracture toughness. The TiB2 contributed more to the hardness than to the toughness. The microstructure analysis shows that the main toughening mechanisms of AlMgB14–TiB2 composites are hard phase dispersion strengthening, high-strength interface bonding and the high elastic modulus of TiB2. Therefore, reducing the particle size of TiB2 to nanoscale is an efficient way to improve the toughness and hardness. The results of friction and wear experiment at room temperature have shown that the addition of TiB2 into AlMgB14 enhances the abrasion–resistant property.

Fracture toughness of a high-strength beryllium at room temperature and 300� C

1977 ◽  
Vol 12 (8) ◽  
pp. 1519-1526 ◽  
Author(s):  
M. W. Perra ◽  
I. Finnie
Keyword(s):  
Fracture Toughness ◽  
Room Temperature ◽  
High Strength

Microstructures and Interfaces in Melt-Growth Al2O3-Ln2O3 Based Eutectic Composites

2006 ◽  
Vol 45 ◽  
pp. 1377-1384 ◽  
Author(s):  
Léo Mazerolles ◽  
N. Piquet ◽  
M.F. Trichet ◽  
Michel Parlier
Keyword(s):  
Fracture Toughness ◽  
Single Crystal ◽  
Room Temperature ◽  
Eutectic Composition ◽  
High Strength ◽  
Ternary Systems ◽  
Growth Conditions ◽  
Temperature Influence ◽  
Directionally Solidified ◽  
Orientation Relationships

Directionally solidified oxide eutectic ceramics were prepared from Al2O3, Ln2O3 and ZrO2 based binary or ternary systems. Their microstructures consist of continuous networks of single-crystal Al2O3 and oxide compounds (LnAlO3, Ln3Al5O12) which interpenetrate without grain boundaries. The outstanding stability of these microstructures gives rise to a high strength and creep resistance at high temperature. Influence of growth conditions on the morphology of the as-obtained microstructures was studied. Preferred growth directions, orientation relationships between phases and single-crystal homogeneity of specimen were revealed. Low residual stresses were measured in the binary eutectics and fracture toughness at room temperature was improved by the addition of zirconia at a eutectic composition in ternary systems.

ALUMINUM 712.0

Alloy Digest ◽  
1984 ◽  
Vol 33 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Compressive Strength ◽  
Room Temperature ◽  
High Strength ◽  
Heat Treating ◽  
Casting Alloy ◽  
Aluminum Casting ◽  
Good Resistance ◽  
Aluminum Casting Alloy ◽  
Temperature Performance

Abstract ALUMINUM 712.0 is a high-strength aluminum casting alloy that is self aging at room temperature. It has good machinability, good dimensional stability and good resistance to corrosion and shock. Among its applications are marine castings, high-strength pressure-tight castings, aircraft components and cylinder heads. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness and fatigue. It also includes information on low and high temperature performance as well as casting, heat treating, machining, and joining. Filing Code: Al-249. Producer or source: Various aluminum companies.

Hall-Petch Relationship in an Al-Mg-Sc Alloy Subjected to ECAP

2014 ◽  
Vol 922 ◽  
pp. 120-125 ◽  
Author(s):  
Andrii Dubyna ◽  
Anna Mogucheva ◽  
Rustam Kaibyshev
Keyword(s):  
Grain Refinement ◽  
Volume Fraction ◽  
Strain Range ◽  
High Strength ◽  
Strengthening Mechanisms ◽  
Dispersion Strengthening ◽  
Remarkable Effect ◽  
Petch Relationship ◽  
Angular Pressing ◽  
Average Size

Effect of extensive grain refinement on mechanical properties of an Al-Mg-Sc alloy subjected to equal-channel angular pressing (ECAP) at 300°C is considered in detail. It was shown that the Hall-Petch relationship with the coefficient, ky, of 0.2 MPa×m1/2 is valid in a wide strain range despite a great difference in deformation structures. Volume fraction of fine grains with an average size of ∼1 μm gradually increases with strain. It is caused by the fact that additive contributions of grain size strengthening and dislocation strengthening to the overall strengthening take place in this alloy. Upon ECAP the extensive grain refinement is accompanied by increasing dislocation density. Superposition of deformation and structural strengthening mechanisms provides achieving very high strength in the alloy. It was shown that ECAP at 300°C has no remarkable effect on a dispersion of coherent dispersoids. Al3(Sc,Zr), which gives a significant contribution to overall strength through dispersion strengthening. Contributions of different strengthening mechanisms to overall strength of the material are analyzed.

The Effects of Substitutional Additions on Tensile Behavior of Nb-Silicide Based Composites

2004 ◽  
Vol 842 ◽  
Author(s):  
Laurent Cretegny ◽  
Bernard P. Bewlay ◽  
Ann M. Ritter ◽  
Melvin R. Jackson
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Room Temperature ◽  
High Strength ◽  
Aircraft Engine ◽  
Tensile Behavior ◽  
Strengthening Mechanisms ◽  
Temperature Capability ◽  
High Temperature Tensile

ABSTRACTNb-silicide based in-situ composites consist of a ductile Nb-based solid solution with high-strength silicides, and they show excellent promise for aircraft engine applications. The Nb-silicide controls the high-temperature tensile behavior of the composite, and the Nb solid solution controls the low and intermediate temperature capability. The aim of the present study was to understand the effects of substitutional elements on the room temperature tensile behavior and identify the principal microstructural features contributing to strengthening mechanisms.

PYROMET X-15

Alloy Digest ◽  
1970 ◽  
Vol 19 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Room Temperature ◽  
High Strength ◽  
Heat Treating ◽  
Notch Toughness ◽  
Low Carbon ◽  
Temperature Performance

Abstract PYROMET X-15 is a low-carbon, martensitic alloy which can be age hardened to give high strength with excellent ductility and notch toughness from room temperature to 1050 F. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-242. Producer or source: Carpenter.

Effect of Mo Addition on Microstructure and Properties of Nb/Nb5Si3 In-Situ Composite

2004 ◽  
Vol 449-452 ◽  
pp. 753-756 ◽  
Author(s):  
Wei Li ◽  
Hai Bo Yang ◽  
Ai Dang Shan ◽  
Jian Sheng Wu
Keyword(s):  
Fracture Toughness ◽  
Room Temperature ◽  
Metastable Phase ◽  
High Strength ◽  
High Fracture Toughness ◽  
High Fracture ◽  
Ductile Phase ◽  
Temperature Fracture ◽  
The Stability

Nb/Nb5Si3 in-situ composites are very attractive structural materials for these materials perform a good balance in mechanical properties, including a high strength at high temperature (>1373K) and reasonably high fracture toughness at room temperature. Metastable phase Nb3Si plays an important role in the properties of Nb/Nb5Si3 composites by affecting microstructure and volume fracture of ductile phase. In this paper, Nb-10Si-xMo and Nb-18Si-xMo (x=0,5,15) are prepared by arc melting and annealed at 1473K for 100h. Single edge-notched bending (SENB) test was used to study the fracture toughness of Nb-Si-Mo alloys. The stability of metastable phase is analyzed by XRD. The room temperature fracture toughness of Nb-10Si is 10.47MPa(m)1/2 and higher than that of binary Nb-18Si alloys at near-eutectic compositions. The addition of Mo improves the fracture toughness of as cast Nb-Si alloys from 4.1 MPa(m)1/2 to 9.9MPa(m)1/2 at near-eutectic compositions and decreases it from 10.47 MPa(m)1/2 to 8.8MPa(m)1/2 at hypoeutectic compositions.

Z-201N

Alloy Digest ◽  
1991 ◽  
Vol 40 (8) ◽  
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Silicon Nitride ◽  
Room Temperature ◽  
High Strength ◽  
High Fracture Toughness ◽  
Bend Strength ◽  
High Fracture ◽  
Engineering Ceramic ◽  
Room Temperature Strength

Abstract Z-201N is a high strength zirconia engineering ceramic. Its room temperature strength is greater than that of silicon carbide and silicon nitride. It also has high fracture toughness. This datasheet provides information on composition, physical properties, hardness, elasticity, and bend strength as well as fracture toughness. Filing Code: Cer-6. Producer or source: Kyocera Industrial Ceramics Corporation.

PYROMET X-12

Alloy Digest ◽  
1964 ◽  
Vol 13 (2) ◽  
Keyword(s):  
Fracture Toughness ◽  
Room Temperature ◽  
Martensitic Stainless Steel ◽  
High Strength ◽  
Heat Treating ◽  
High Heat ◽  
Jet Engines ◽  
Steam Turbines ◽  
Temperature Performance ◽  
Structural Parts

Abstract Pyromet X-12 is a martensitic stainless steel offering high strength at both room temperature and high heat. It is recommended for use in jet engines, steam turbines and aircraft structural parts. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and creep. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SS-152. Producer or source: Carpenter.

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