Mechanical Behavior and Failure Mechanisms of SCS-6/Ti3Al Composites

1990 ◽  
Vol 194 ◽  
Author(s):  
S. M. Jeng ◽  
C. J. Yang ◽  
J.-M. Yang ◽  
D. G. Rosenthal ◽  
J. Goebel
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Room Temperature ◽  
Failure Mechanisms ◽  
Crack Initiation And Propagation ◽  
Al Composite ◽  
Initiation And Propagation ◽  
Bend Tests ◽  
Scanning Electron

AbstractThe mechanical properties and failure mechanisms of the SCS-6/Ti3Al composite have been studied. Both tensile and notched bend tests were conducted at room temperature on the monolithic and fiber-reinforced Ti-25Al-10Nb-3V-1Mo. Optical and scanning electron microscopy were used to study the crack initiation and propagation mechanisms. The role of the fiber, matrix and interfacial properties on the composite behavior was also assessed.

Effect of Nitrogen on the Mechanical Properties of Heat-Resisting Steel

2012 ◽  
Vol 535-537 ◽  
pp. 571-575
Author(s):  
Xiao Liu ◽  
Long Mei Wang
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Room Temperature ◽  
Rupture Strength ◽  
N Addition ◽  
Creep Rupture Strength ◽  
Test Steel ◽  
Scanning Electron

In this paper, the effect of N addition on mechanical properties of 21Cr-11Ni austenitic heat-resisting stainless steel was investigated. Scanning electron microscopy was used to study the fracture surfaces in the steels. N in 21Cr–11Ni heat-resisting steel can play a role of stabling austenite and ensuring the structure and mechanical properties in high temperatures. Fracture is changed from cleavage to ductile fracture to 21Cr–11Ni heat-resisting steel, and the strength of test steel are improved at room temperature by adding N, the tensile strength is increased by 8.33%. And the creep rupture strength is improved. The fracture time of the steel containing 0.2% N is 3.2 times higher than the steel containing 0.14% N at 1144K.

On The Fatigue Short Crack Behaviors of Directionally Solidified Superalloy DZ4 by In Situ SEM Observations

2010 ◽  
Vol 118-120 ◽  
pp. 289-293
Author(s):  
Xian Feng Ma ◽  
Hui Ji Shi
Keyword(s):  
Electron Microscopy ◽  
Crack Growth ◽  
Short Crack ◽  
Directionally Solidified ◽  
Crack Initiation And Propagation ◽  
Small Fatigue Crack ◽  
Initiation And Propagation ◽  
Different Temperatures ◽  
Scanning Electron

Small fatigue crack behaviors in a nickel-based directionally solidified superalloy DZ4 were studied by in situ scanning electron microscopy. The crack initiation and propagation manners were identified under different temperatures, i.e. 25oC, 350oC, 700oC. Crack growth showed to be associated with the configuration and relative direction of carbide. The anomalous short crack growth was pronounced at 25oC, 350oC and not evident at 700oC, which was analyzed by in situ examining the effect of microstructure.

Modification of DABA/BMI Composites by Silane Compound and Fumed SiO2

2012 ◽  
Vol 622-623 ◽  
pp. 1006-1013
Author(s):  
Nazakat Alia ◽  
Qiu Yu Zhang ◽  
Yin Wu ◽  
Ying Chen
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Thermal Properties ◽  
Fumed Silica ◽  
Heat Stability ◽  
Nano Composite ◽  
Bending Modulus ◽  
Scanning Electron

In this present investigation, at first, Dially bisphenol A (DABA)/Bismaleimide (BMI) system was modified with gamma-aminopropyltriethoxy silane (KH550). The objective of the work was to study the effect of addition of various weight percentages of KH550 into BMI/DABA composites on its mechanical properties, thermal properties and morphorogy. Further modification was carried out with fumed silica. The role of KH550 was discussed in these composites prepared. Nancomposites were characterized by differential DSC, TGA, and scanning electron microscopy SEM. TGA results confirmed that the heat stability of the nano composite DABA/BMI/KH550 is improved compared with DABA/BMI system. SEM results indicated that the fumed silica dispersed homogeneously in DABA/BMI/KH550 matrix on nanoscale. Mechanical results shows that newly developed system has improved bending modulus to 4.0GPa, while with incorporation of fumed SiO2 impacted strength also improved to 20.60kJ/m2.

Mechanical Properties of Polyvinyl Chloride Composites Reinforced with Magnesium Borate Whiskers

2013 ◽  
Vol 821-822 ◽  
pp. 1143-1147
Author(s):  
Lie Li ◽  
Xue Ying Nai ◽  
Gui Min Qian ◽  
Dong Hai Zhu ◽  
Wu Li
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Room Temperature ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Magnesium Borate ◽  
Binding Force ◽  
Adsorbed Layers ◽  
Surface Contact Angle ◽  
Scanning Electron

To improve the strength and toughness performance of PVC, the resin reinforced with magnesium borate whiskers (MBOW ) were prepared by mixing whiskers into liquid PVC at room temperature. The effects of borate coupling agent (SBW-III) and contents of MBOw (0~30wt%) on tensile of PVC and composites were studied. The compatibility, hydrophilicity and morphology of MBOw/PVC composites were characterized by Fourier transform infrared spectroscopy ( FTIR), surface contact angle measurement and scanning electron microscopy (SEM) respectively. The results show that both the chemical bonding and physically adsorbed layers exist between MBOw and SBW-III. The surface of modified MBOw is hydrophobic which improves the binding force between PVC and treated MBOw, and the dispersibility of MBOw in PVC significantly. The tensile and the elastic modulus of the SBW-III-treated MBOw /PVC composites increase in comparison to that of the composites filled with untreated MBOw.

Effects of Ca and Y on Microstructures and Mechanical Properties of Magnesium Alloy AZ81

2014 ◽  
Vol 488-489 ◽  
pp. 154-157
Author(s):  
Lei Lei Chen ◽  
Quan An Li ◽  
Jiang Chang Xie
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Grain Size ◽  
Magnesium Alloy ◽  
Room Temperature ◽  
Microstructure And Mechanical Properties ◽  
Mechanical Properties Testing ◽  
Microstructures And Mechanical Properties ◽  
Scanning Electron

By the scanning electron microscopy, the microstructure and mechanical properties testing, the effect of Ca and Y on the microstructure and mechanical properties of magnesium alloy AZ81 are investigated in this paper. The results show that with Ca and Y addition, the grain size is refined. And with the β-Mg17Al12 phase reducing significantly, there will be the precipitation of Al2Ca and Al2Y. Meanwhile, the mechanical properties of AZ81 magnesium alloy are enhanced at room temperature and 150°C.

Microstructural and Mechanical Properties of Ti3Al-Based Intermetallics Produced by Powder Metallurgy

2005 ◽  
Vol 494 ◽  
pp. 211-216 ◽  
Author(s):  
B. Dimčić ◽  
M. Vilotijević ◽  
D. Božić ◽  
D. Rajnović ◽  
M.T. Jovanović
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Room Temperature ◽  
Solution Treatment ◽  
Microstructural Characterization ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

The structural and compression mechanical properties of Ti3Al-based intermetallics produced by powder metallurgy techniques have been studied. The as-milled powders were compacted by hot pressing to non-porous homogenous compacts. Prior to compression tests, all compacts were homogenized by a solution treatment at 1050°C (a+β region) for 1h, followed by water quenching. The compression tests were performed from room temperature to 500°C in vacuum at a strain rate of 1 3 10 4 . 2 − − × s . Detailed microstructural characterization was evaluated by scanning electron microscopy (SEM), followed by energy dispersive spectroscopy (EDS) and X-ray diffraction analysis.

scholarly journals Reduction of borax / agar-based gel residues used to neutralize acidity of a historical manuscript with use of different paper barriers: Artificial ageing results

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 6576-6599
Author(s):  
Eman Salim ◽  
Mostafa Abdel-Hamied ◽  
Sehame Salim ◽  
Sheeren Gamal ◽  
Shimaa Mohamed ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Color Change ◽  
Analytical Techniques ◽  
Cellulose Fibers ◽  
Great Success ◽  
Artificial Ageing ◽  
Agar Gel ◽  
Scanning Electron

Borax-agar gel has been used recently in the deacidification and other conservation processes for paper manuscripts. However, the residues of borax-agar can be damaging to the cellulose fibers. Conservators are trying to solve this problem, especially with the great success achieved by the borax / agar based gel in the acidity neutralization and improve the mechanical properties of the paper manuscripts. The current study considers whether the use of paper barriers such as Japanese gampi, linen, and rayon can reduce harmful borax-agar residues. Historical paper specimens were treated with 3% and 6% of agar poultice with different barriers such as rayon, pure linen, and Japanese gampi paper. After drying, the treated paper samples were exposed to hot-moist ageing at 80 °C and 65% relative humidity for 72 h. The role of different barriers used in the reduction of residues from agar poultice and the effect of these residues on cellulose fibers were studied via some analytical techniques, such as digital optical microscopy, scanning electron microscopy, pH, color change, and Fourier-transform infrared spectroscopy (FTIR), were used. The results showed that 3% of the agar poultice-borax with a linen barrier gave the best results with no residue left after treatment.

The Influence of B4C on Mechanical Properties of MgO-SiC Based Refractory Castables

2013 ◽  
Vol 634-638 ◽  
pp. 2397-2401 ◽  
Author(s):  
Jun Cong Wei ◽  
Jing Wang ◽  
Jun Bo Tu
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Liquid Phase ◽  
Room Temperature ◽  
The Other ◽  
Cold Strength ◽  
Refractory Castables ◽  
Direct Binding ◽  
Scanning Electron

The effects of B4C addition on the room temperature physical properties and hot mechanical properties of MgO-SiC based refractory castables were investigated using magnesia and SiC fines as starting materials and silica fume as a binder. The microstructure was characterized by scanning electron microscopy (SEM). The results showed that drying strength of MgO-SiC based castables decreased with the increase in B4C addition, the immediate temperature strength and hot temperature strength increased. The HMOR at 1400°C for 0.5h decreased. This is because B4C oxidized and produced a liquid phase during heating, contributing to sintering and making the material denser. So the cold strength increased. On the other hand, due to the formation of liquids, direct binding reduced and the HMOR decreased

Microstructure and Mechanical Properties of as-Forged Ti-47Al-2Cr-2Nb-Y Alloy

2011 ◽  
Vol 311-313 ◽  
pp. 1873-1878
Author(s):  
Shu Zhi Zhang ◽  
Fan Tao Kong ◽  
Yu Yong Chen ◽  
Shu Long Xiao ◽  
Chao Cao
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Room Temperature ◽  
B2 Phase ◽  
Hot Pack ◽  
Scanning Electron

Ti-47Al-2Cr-2Nb-Y alloy pancake were produced by hot-pack forging. The microstructure of as-forged Ti-47Al-2Cr-2Nb-Y alloy were investigated by optical microscopy and scanning electron microscopy, showing that the forged alloy was composed of fine γ grains and retain cast lamella colonies surrounded by elongated B2 phase. Tensile properties of the material showed that yield strength (YS) and ultimate tensile strength (UTS) were decreased from 500MPa and 612MPa at room temperature to 420 MPa and 462 MPa at 800°C, respectively. With the temperature increasing to 900°C, elongation reached 120%.

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