Electronic, elastic, and thermal properties, fracture toughness, and damage tolerance of TM5Si3B (TM = V and Nb) MAB phases

2022 ◽  
pp. 105781
Author(s):  
Yuan Sun ◽  
Ancang Yang ◽  
Yonghua Duan ◽  
Li Shen ◽  
Mingjun Peng ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Thermal Properties ◽  
Damage Tolerance

High Toughness Ceramic Laminates by Design of Residual Stresses

2001 ◽  
Vol 702 ◽  
Author(s):  
Nina A. Orlovskaya ◽  
Jakob Kuebler ◽  
Vladimir I. Subotin ◽  
Mykola Lugovy
Keyword(s):  
Fracture Toughness ◽  
Residual Stresses ◽  
Damage Tolerance ◽  
High Strength ◽  
Ceramic Composites ◽  
Tensile Stresses ◽  
High Toughness ◽  
Apparent Fracture Toughness ◽  
Layered Ceramics ◽  
Compressive Residual Stresses

ABSTRACTMultilayered ceramic composites are very promising materials for different engineering applications. Laminates with strong interfaces can provide high apparent fracture toughness and damage tolerance along with the high strength and reliability. The control over the mechanical behavior of laminates can be obtained through design of residual stresses in separate layers. Here we report a development of tough silicon nitride based layered ceramics with controlled compressive and tensile stresses in separate layers. We design laminates in a way to achieve high compressive residual stresses in thin (100-150 micron) Si3N4 layers and low tensile residual stresses in thick (600-700 micron) Si3N4-TiN layers. The residual stresses are controlled by the amount of TiN in layers with residual tensile stresses and the layers thickness. The fracture toughness of pure Si3N4(5wt%Y2O3+2wt%Al2O3) ceramics was measured to be of 5 MPa m1/2, while the apparent fracture toughness of Si3N4/Si3N4-TiN laminates was in the range of 7-8 MPa m1/2 depending on the composition and thickness of the layers.

A Systematic Material Design Approach to Develop Self-Lubricating Ceramic-Composite Tool Inserts for Dry Cutting Conditions

2019 ◽  
Author(s):  
Syed Sohail Akhtar
Keyword(s):  
Fracture Toughness ◽  
Thermal Properties ◽  
Volume Fraction ◽  
Mean Field ◽  
Material Design ◽  
Ceramic Materials ◽  
Ceramic Composites ◽  
Design Stage ◽  
Mechanical And Thermal Properties ◽  
Dry Cutting

Abstract A systematic approach is the focus of the current work in order to design and develop ceramic composites for cutting tool inserts with a balanced combination of structural and thermal properties together with enhanced antifriction characteristics. In the material design stage, various combinations of ceramic materials and inclusions with optimum self-lubricating attributes are selected based on predictions of mechanical and thermal properties using in-house built codes. A mean-field homogenization scheme is used to predict the constitutive behavior while J-integral based fracture toughness model is used to predict the effective fracture toughness of the ceramic composites. An effective medium approximation is used to predict the potential optimum thermal properties. The current strategy incorporates thermal and structural properties of composites as a constraint on the design process together with self-lubrication property. Among various metallic and carbon-based fillers, silicon carbide (SiC) together with titanium oxide (TiO2) and graphite are found the most suitable candidate fillers in alumina (Al2O3) matrix to produce cutting inserts with best combinations of thermal, structural and tribological properties. As a validation, various combinations of Al2O3-SiC-TiO2 and Al2O3-SiC-TiO2 composites are developed in line with the designed range of filler size and volume fraction using Spark Plasma Sintering (SPS) process to complement the material design.

Effect of Heat Treatment on the Damage Tolerance Properties of Ti-6Al-2Zr-2V-1.5Mo ELI Alloy Plate

2011 ◽  
Vol 690 ◽  
pp. 282-285
Author(s):  
Xiao Xiang Wang ◽  
Song Xiao Hui
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Fatigue Crack ◽  
Annealing Temperature ◽  
Damage Tolerance ◽  
Phase Zone ◽  
Alloy Plate ◽  
Β Phase ◽  
Α Phase ◽  
Treatment Conditions

Effect of heat treatment on the damage tolerance properties of a newly developed middle strength high damage tolerance Ti-6Al-2Zr-2V-1.5Mo ELI alloy plate has been investigated in this paper by testing fracture toughness and fatigue crack-extending rate of the plate under three heat treatment conditions and fractograph inspection of the samples. It has been found that with the increasing of the primary annealing temperature from 900°C to 950°C, the fracture toughness increased and the fatigue crack extending rate decreased significantly. Microstructural observation has found that the crack expanded through the α beaming and mainly are perpendicular to the α orientation in the lamellar structure which annealed in α+β phase zone. For the Widmanstaten structure, which can be obtained from annealing in single β phase zone, the continuous grain boundary α phase and α beaming boundary hinder the crack expanding significantly.

Interlocking thin-ply reinforcement concept for improved fracture toughness and damage tolerance

2019 ◽  
Vol 181 ◽  
pp. 107681 ◽  
Author(s):  
John-Alan Pascoe ◽  
Soraia Pimenta ◽  
Silvestre T. Pinho
Keyword(s):  
Fracture Toughness ◽  
Damage Tolerance

Effect of HVOF spraying parameters on fracture, erosion and thermal properties of Fe alloy-based coating materials

2021 ◽  
pp. 146442072199968
Author(s):  
Ratnesh Kumar Sharma ◽  
Randip Kumar Das ◽  
Shiv Ranjan Kumar
Keyword(s):  
Fracture Toughness ◽  
Thermal Properties ◽  
Wear Rate ◽  
Flow Rate ◽  
High Velocity ◽  
Oxygen Flow Rate ◽  
Oxygen Flow ◽  
Erosion Wear ◽  
Micro Hardness ◽  
Spray Distance

Fe-based coating (Fe50Mo5C15Si10Cr10Ti10) was deposited on 316L stainless steel substrate by high-velocity oxy-fuel spraying coating process. High-velocity oxy-fuel spraying process parameters such as oxygen flow rate and spray distance were varied to investigate their effect on mechanical, wear and thermal properties. The prepared coatings were characterized in terms of mechanical properties such as micro-hardness and fracture toughness, thermal properties and erosion wear properties. X-ray diffraction analysis showed presence of hardened phase Fe2Ti and Fe-Cr. Results of this study indicated that increase in oxygen flow rate from 200 to 250 slpm improved the fracture toughness and micro-hardness by 33% and 6.7%, respectively. On the other hand, increase in spray distance decreased the fracture toughness and micro-hardness by 27.2% and 6.7%, respectively. The wear rate was increased with the increase in oxygen flow rate and decreased with the increase in spray distance. The erosion wear rate was more dependent on fracture toughness as compared to micro-hardness.

scholarly journals Reliability Analysis of a Structural Ceramic Combustion Chamber

1991 ◽  
Author(s):  
Jonathan A. Salem ◽  
Jane M. Manderscheid ◽  
Marc R. Freedman ◽  
John P. Gyekenyesi
Keyword(s):  
Fracture Toughness ◽  
Thermal Properties ◽  
Silicon Nitride ◽  
Weibull Modulus ◽  
Fracture Criterion ◽  
Structural Ceramic ◽  
Design Code ◽  
Gas Turbine Combustor ◽  
Bend Tests ◽  
Data Censoring

The Weibull modulus, fracture toughness, and thermal properties of a silicon nitride material used to make a gas turbine combustor were experimentally measured. The location and nature of failure origins resulting from bend tests were determined with fractographic analysis. The measured Weibull parameters were used along with thermal and stress analysis to determine failure probabilities of the combustor with the CARES design code. The effects of data censoring, FEM mesh refinement, and fracture criterion were considered in the analysis.

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