Materials Free Full-Text Characterization of SiC
In this work (Au79Ni17Pd4)96Ti4 (wt. ) filler alloy was designed and employed to join SiC ceramics. The effects of brazing temperature and soaking time on the microstructure and fracture morphology of joints were investigated. The results show that the joint obtained can be described as SiC/reaction layer/braze/reaction layer/SiC. The reaction layer was composed of TiC and Au (Si Ti).
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Overview of residual stress in MEMS structures Its origin
The residual stress may significantly affect the performance and reliability of the fabricated devices. Thus the evaluation and regulation of residual stress are one of the crucial aspects to assess the functioning of modern-day MEMS devices. This paper reviewed the origins of residual stress in MEMS fabrication processes.
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Effect of target peak power density on the phase formation
Mar 01 2021 · The annealed Cr 2 AlC sample possesses a Young s modulus of 334 ± 10 GPa and the (Cr Al) 2 C x sample exhibits a Young s modulus of 319 ± 3 GPa. Both Young s moduli values are in excellent agreement with the ab initio derived Young s moduli for the stress-free scenario of 349 and 333 GPa for Cr 2 AlC and (Cr Al) 2 C x respectively.
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Effect of Tensile Strength on the Microstructure of
The effect of mech. stresses on the dynamic Young s modulus measured by the ultrasonic wave method was examd. for an isotropic graphite . Young s modulus of the graphite decreased with increasing applied stress though the amt. of its decrease was different between tensile and compressive stresses.
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Analyses of the role of the second phase SiC particles in
Mar 11 2008 · Figure 1. Microstructures analyzed with explicit resolution of GBs and second phase SiC particles. (a) Microstructure Class-I with SiC particles only in the Si 3 N 4 grain interiors (b) microstructure Class-II with SiC particles lying only along GBs and (c) microstructure Class-III with SiC particles lying both along GBs and in Si 3 N 4 grain interiors (three different variations of each
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Effect of crystallographic orientation on residual stress
In micro-grinding the effect of material microstructure on residual stress is significant since the depth of cut is usually smaller than the average grain size. In this paper the effect of crystallographic orientation (CO) on the distribution of residual stress induced by micro-grinding is investigated. The COs and their volume fractions of workpiece material are quantified by Taylor factor
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OOF And Beyond 2D Plasticity and 3D Microstructure
Modeling the effect of second phase morphology on Young s Modulus E sphere L = 1.00 E needle L = 1.01 E sphere T = 1.00 E Normalized Young s Modulus E 10 15 20 25 30 c /E m (GPa) Volume Percentage of SiC Longitudinal Stress SiC Stress Al 2080. Effect of model size 0 100 200 300 400 500 600 0 0.005 0.01 0.015 0.02 015 30 45 400 420
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Effect of near-surface residual stress and microstructure
Dec 01 2002 · Abstract. JMEPEG (2002) 11 ©ASM International Effect of Near-Surface Residual Stress and Microstructure Modification From Machining on the Fatigue Endurance of a Tool Steel F. Ghanem C. Braham M.E. Fitzpatrick and H. Sidhom (Submitted 24 January 2002 in revised form 27 June 2002) This study concerns the effect of machining on the fatigue life of an EN
Get PriceStainless steel du plexaimnet
Phase h k l 2θ Poisson Young s Modulus / MPa Austenite 2 2 0 129° 0.28 207 039 Ferrite 2 1 1 156° 0.28 220 264 Tab.3Elastic constants used for this paper. The 2θ positions are given for a Cr K α source Mesoscopic StressσII The mesoscopic stress σII frequently also denoted type II micro stress for the respective phases was
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Origin of high strength low modulus superelasticity in
Apr 12 2017 · Macro strain-stress curves before and after mechanical pretreatment. Figure 3(a) shows the stress–strain curves of the finite element model with the V N = 25 L/d = 20. The black and blue
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Effect of near-surface residual stress and microstructure
Dec 01 2002 · Abstract. JMEPEG (2002) 11 ©ASM International Effect of Near-Surface Residual Stress and Microstructure Modification From Machining on the Fatigue Endurance of a Tool Steel F. Ghanem C. Braham M.E. Fitzpatrick and H. Sidhom (Submitted 24 January 2002 in revised form 27 June 2002) This study concerns the effect of machining on the fatigue life of an EN
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Overview of residual stress in MEMS structures Its origin
The residual stress may significantly affect the performance and reliability of the fabricated devices. Thus the evaluation and regulation of residual stress are one of the crucial aspects to assess the functioning of modern-day MEMS devices. This paper reviewed the origins of residual stress in MEMS fabrication processes.
Get PriceA Computational Approach on Prediction of Welding
filed microstructure and stress/strain are very complex. It should be pointed out that we have neglected some factors such as the heat generated by plastic deformation the latent heat due to solid-state phase change and the effect of stress on phase change. Fig. 1 Coupling effects among temperature microstructure and stress/strain 11
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Effect of microstructure on Young s modulus of extruded Al
Anelastic behavior of an SiC particulate reinforced aluminum composite has been examined through the measurements of the dynamic Young s modulus and internal friction over a temperature range from
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Mechanical properties stress evolution and high
A study of the microstructure thermal stability nanoindentation mechanical properties and residual stress evolution of nanolayered Mo endash Si endash N/SiC thin films as a function of vacuum annealing time and temperature is reported. and SiC at 900thinsp degree C has been demonstrated. Hardness modulus and residual stress followed the
Get PriceEvolution of Microstructure and Residual Stress in Hot
converted to residual stress assuming a Young s Modulus of 118 GPa and Poisson s Ratio of 0.342. Although Ti-6Al-4V is a dual phase alloy it consists of approximately 92 α phase at room temperature and therefore the stress associated with the β phase is assumed to have a minimal effect on the overall residual stress magnitude 2 .
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Stress-Strain Behavior of Thermoplastic Polyurethane
2 Stress-Strain Behavior of Thermoplastic Polyurethane H.J. Qi1 2 M.C. Boyce1 1Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge MA 02139 2Department of Mechanical Engineering University of Colorado Boulder CO 80309 Submitted in December 2003 Revised in July 2004
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Relation between residual stresses and microstructure
Relation between residual stresses and microstructure evolution in Al–Si alloys based on different casting parameters Young s modulus of 70 GPa. 25-40 reduction in residual stress
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Effect of alumina on the curvature Young s modulus
The effects of Al2O3 on the curvature Young s modulus TEC and residual stress of the SOFC with (NiO–YSZ)1−x(Al2O3)x (x=1–5wt ) anode support are discussed in this work. Discover the world
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Effect of Laser Shock Peening (LSP) on the Phase Evolution
effect of laSer Shock PeeNiNg (lSP) 101 σ φ ϑ = − m d E hkl 1 0 1 (3) where m is the slope of the dversus sin2ψ curve d 0 is the stress-free lattice spacing (d0≈dφ 0 where dφ 0 is the stress free interplanar lattice spacing) E is the Young s modulus and υ is the Poisson s ratio. The suffix hkl refers to a particular crystallographic plane.
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The Effect of Microstructure and Pre-strain on the Change
May 30 2017 · The elastic recovery in dual-phase (DP) steels is not a linear process and changes with plastic deformation. The level of change in the apparent Young s modulus has been reported to depend on material composition and microstructure but most previous experimental studies were limited to industrial DP steels and led to contradicting results.
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Effect of Tensile Strength on the Microstructure of
The effect of mech. stresses on the dynamic Young s modulus measured by the ultrasonic wave method was examd. for an isotropic graphite . Young s modulus of the graphite decreased with increasing applied stress though the amt. of its decrease was different between tensile and compressive stresses.
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Measurement of swelling-induced residual stress in ion
Sep 01 2020 · Young s modulus was 460.7 GPa and Poisson s ratio was 0.206. The effect of residual stress is perhaps not as obvious in metals as in SiC as indents in neither the unirradiated nor irradiated metal crack there is not an obvious change in deformation response which would spark further investigation. Microstructural evolution of helium
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Effects of SiC content on phase evolution and corrosion
Jul 01 2019 · SiC dispersed (4 8 12 and 16 wt ) 316L stainless steel metal matrix composites (MMCs) have been prepared by laser melting deposition (LMD). The constituent phases microstructure microhardness and electrochemical properties of the MMCs were investigated as a function of SiC content. Experimental results showed that constituent phases of the MMCs evolved from single γ-(FeCrNi) phase
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Mechanical properties of hot-pressed high-entropy diboride
properties including Young s modulus bulk modulus shear modulus Poisson s ratio Vickers hardness four-point flexural strength and fracture toughness by single-edge notched beam (SENB) technique are systematically investigated. The effect of SiC secondary phase on the microstructure evolution and mechanical
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Effect of SiC on Microstructure Phase Evolution and
The microstructures of HECs containing SiC (x = 0.5 1.0 2.0 and 3.0) consist of three distinct phases—bright gray and dark (marked as 1 2 and 3 in the microstructure of HEC-(SiC)0.5 in Figure 3). Whereas the microstructure of HEC without addition of SiC (HEC-(SiC)0) show four different contrasts (marked as 1 to 4 in HEC-(SiC
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Residual stress and its role in failureIOPscience
Nov 27 2007 · with σ rs (T t) the residual stress value after annealing at temperature T (in K) for the time t (min) the initial near surface residual stress ΔH the activation enthalpy for the actual residual stress relaxation process (= 3.3 eV for AISI 4140 stainless steel) m (=0.122) an exponent C (=1.22 10 21 min −1) a rate constant and k the
Get PriceCoatings Free Full-Text Effect of Interface Coating on
The distribution of residual radial stress in SiC–SiC composites is shown in Figure 6. It can be seen clearly that the residual radial stress decreases with temperature. When the temperature exceeds 850 °C the residual radial stress transforms from tensile to compressive which prevents the crack propagation into the interface coatings.
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Effect of Young s Modulus Evolution on Residual Stress
Effect of Young s Modulus Evolution on Residual Stress Measurement of Thermal Barrier Coatings by X-ray Diffraction September 2010 Applied Surface Science 256(23)
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