Influence of Heat Treatment Process on Tensile Fracture Behavior of Cu-Based Metallic Glass

2013 ◽  
Vol 742 ◽  
pp. 170-174
Author(s):  
Ling Zhang ◽  
De Chun Luo ◽  
Xiang Bin Yi
Keyword(s):  
Tensile Strength ◽  
Fracture Behavior ◽  
Isothermal Annealing ◽  
Flow Behavior ◽  
Performance Testing ◽  
Fracture Morphology ◽  
Test Sample ◽  
Fracture Pattern ◽  
Tensile Fracture ◽  
Venation Pattern

The Cu50Zr42Al8dumbbell-shaped alloy with original scale distance of 25 mm and diameters of 4.5 mm was prepared by the suspend melting-copper mould suction casting. The structure tensile performance testing and the fracture morphology observation of Cu50Zr42Al8BMG as-quenched and 400k/1h isothermal annealing were investigated, respectively. The deformation and fracture behavior of samples had been studied. The results showed that the structure of all samples were composed of amorphous phase and possess good glass formation abilitysample as-quenched is always in the elastic deformation stage during elongation and the tensile strength is 629MPa; however ,for specimen after 400k/1h isothermal annealing ,the yield phenomenon occurs before breaking and the maximum tensile strength is 755Mpa, and the same time, the maximum failure extensibility increases from 0.56% for sample as-quenched to 0.80% for 400k/1h isothermal annealing. The fracture pattern of test sample at annealing assumes venation pattern, which is similar to fractography of Cu50Zr42Al8BMG as-quenched, in addition, which appeared apparent viscous flow behavior and melting characteristics.

Fracture Behavior of Organic Silicon Rubber at Different Extension Rate

2011 ◽  
Vol 687 ◽  
pp. 571-575
Author(s):  
Xiao Liu ◽  
Wei Fang Zhang ◽  
Sheng Wang Liu ◽  
Wei Guo Hou ◽  
Mei Li Ding
Keyword(s):  
Tensile Strength ◽  
Fracture Behavior ◽  
Tensile Fracture ◽  
Extension Rate ◽  
Silicon Rubber ◽  
Organic Silicon ◽  
Flat Region ◽  
Secondary Cracks ◽  
Rough Region ◽  
Relationship Of

Fracture behavior of organic silicon rubber at the extension rate of 100, 300, 500 and 700 mm/min at room temperature was studied in this paper. The fracture surface morphology was observed by scanning electron microscopy (SEM). Effects of different extension rate on the tensile strength tensile fracture behavior and mechanism were investigated. The results showed that fracture of the organic silicon rubber was composed by flat region and rough region, while the rough region was relatively small. With the increasing extension rate, the area of flat region enlarged while rough region decreased, and the secondary cracks appeared when the extension rate reached critical value. The relationship of the tensile strength and elongation with the extension rate were similar, both of which rised and then droped as the extension rate increased, and further studies were needed for the fracture mechanism.

Influence of Ag Micro-Addition on the Glass Forming Ability, Thermal Stability and Compression Performance of Cu-Based Metallic Glasses

2013 ◽  
Vol 744 ◽  
pp. 306-310
Author(s):  
Ling Zhang ◽  
De Chun Luo ◽  
Wen Chun Chang ◽  
Xiu Zhi Xu
Keyword(s):  
Thermal Stability ◽  
Metallic Glasses ◽  
Fracture Morphology ◽  
Fracture Pattern ◽  
Failure Behavior ◽  
Scanning Calorimetry ◽  
Venation Pattern ◽  
Compression Performance ◽  
Deformation And Fracture ◽  
Thermal Stability Of

The alloy rods with diameters of 3.0 mm of Cu50-xZr42Al8Agx(x=0,2,3,4)were prepared by means suspend melting-copper mold suction casting. The structure and thermal stability of the alloys were analyzed by X-ray diffraction (XRD) and differential scanning calorimetry (DSC), respectively. Subsequently, compression performance and fracture morphology of these bulk metallic glasses were investigated .we focus on analysis that influence of Ag micro-addition on the deformation and fracture of speciments. The results showed that the addition of Ag can enhance the forming ability and thermal stability of amorphous alloys. At the same time, with the increase of Ag content, the breaking strength of samples was improved from 1747Mpa to 2038Mpa. Without obvious plastic elongation percentage in bulk metallic owing to non-homogeneous modes of texturing at room-temperature. The compression failure behavior of test samples belong to elastic failure and the maximum failure extensibility is 3.7%.The fracture pattern of test samples all assume venation pattern.

Fracture Behavior and Microstructure of 60Si2MnA Spring Steels Modified by V-Nb Inoculants

2011 ◽  
Vol 415-417 ◽  
pp. 1085-1089
Author(s):  
Tie Bao Wang ◽  
Chun Xiang Cui ◽  
Lin Fang ◽  
Shao Jing Bu
Keyword(s):  
Melt Spinning ◽  
Fracture Behavior ◽  
Prior Austenite ◽  
Fracture Morphology ◽  
Tensile Fracture ◽  
Grain Sizes ◽  
Austenite Grain ◽  
Spring Steels ◽  
Nb Microalloyed Steel ◽  
Prior Austenite Grain

The microstructure of V-Nb inoculants after melt spinning was investigated by performing TEM examination and to the sample steels, the prior austenite grain sizes and fracture morphology were investigated by SEM observation. The results show that the V-Nb inoculants obtained is amorphous and the sample steel modified by V-Nb inoculants which make it possible to be a large amount of nucleation centers existing in the form of (V, Nb)C and achieve the effect of grain refinement in the solidification stages of liquid steel has been found to have the finest prior austenite grain sizes and the average prior austenite grain sizes of steel without addition of V and Nb(Steel A), steel microalloyed with V and Nb(Steel B) and steel modified by V-Nb inoculants(Steel C) are respectively 30μm, 20μm and 10μm. Tensile behavior of samples was studied under tempering at 400°C for 30 min after quenching, tensile results show that the fracture of steel modified by V-Nb inoculants appears dimples which represent ductile fracture. However the tensile fracture of V-Nb microalloyed steel is mixture of quasi-cleavages and dimples. Under tempering at 550°C for 30 min, Steel B and Steel C both show a fractograph with cleavage fracture.

scholarly journals Studies on Fabrication and Characterization of Nanoclay Reinforced Nylon-6 composites: Enhancement of Heat distortion Temperature

2010 ◽  
Vol 13 (1-2) ◽  
pp. 67
Author(s):  
S. Manocha ◽  
Valay Solanki ◽  
Nikesh Patel ◽  
L.M. Manocha
Keyword(s):  
Tensile Strength ◽  
Impact Strength ◽  
Crystallization Rate ◽  
Fracture Morphology ◽  
Nylon 6 ◽  
Degree Of Crystallinity ◽  
Tensile Fracture ◽  
Processing Temperature ◽  
Izod Impact Strength ◽  
Izod Impact

<p>Organically modified nanoclay (cation exchange capacity of 135 to 145 meq/100 g) was used as nanophase reinforcement for fabrication of nylon-6 nanocomposites. The thickness of clay platelets varied form 1.2 nm to 1.3 nm with 3.485 nm as d-spacing. Nylon 6/nanoclay composites were fabricated with loading of 2.5, 5.0 and 10 wt.% nanoclay via direct melt compounding technique using conventional twinscrew extruder. Processing temperature profile from hopper to header was 230-240-245-260 °C and screw speed was maintained at 180 rpm. The nylon 6/clay nanocomposites were characterized for thermal and mechanical properties. The structural properties were characterized by Differential Scanning Calorimeter (DSC) and X-ray diffraction analysis. The tensile fracture morphology was analyzed by using Scanning Electron Microscope (SEM). DSC nonisothermal curves show an increase in the crystallization temperature with increasing degree of crystallinity. The crystallization rate of the nanoclay reinforced nylon 6 composites was found to be significantly faster than that for the pristine nylon 6 and suggests that the layered silicates act as nucleating centers. XRD result shows that addition of nanoclay by this technique favors the formation of γ-crystalline phase in nylon 6/nanoclay composites. Due to this, there is substantial enhancement in the tensile strength and Izod impact strength. A variation from 700 to 971 Kg/cm<sup>2</sup> for tensile strength and from 3.0 to 3.4 Kg.cm/cm of notch for Izod impact strength. The detailed results are presented.</p>

Comparison of Tensile Fracture Behavior between Si-Ti-C-O Fiber Bundle (Yarn), Woven Fabric of Yarn and Laminated Composite of the Si-Ti-C-O Fabric / Mullite Filler / Polytitanocarbosilane System

2005 ◽  
Vol 287 ◽  
pp. 432-437
Author(s):  
Tomoyuki Maeda ◽  
Yoshihiro Hirata ◽  
Joe Sugimoto ◽  
Soichiro Sameshima ◽  
Toshifumi Yoshidome ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Fracture Behavior ◽  
Laminated Composite ◽  
Fracture Probability ◽  
Woven Fabric ◽  
Tensile Fracture ◽  
Normal Distribution Function ◽  
Pyrolysis Method ◽  
Polymer Impregnation ◽  
Xylene Solution

A polytitanocarbosilane (20-30 mass%)-xylene solution was infiltrated into a porous laminated composite with 35-40 vol% Si-Ti-C-O fabric of 11 diameter fiber and 15-25 vol% mullite filler, and decomposed at 1000°C in an Ar atmosphere. This polymer impregnation and pyrolysis method was repeated 8 times to produce the composites of 76-82 % theoretical density. The yarn (662-765 filament / yarn), fabric and composite provided the following average strengths : 1240 MPa for the yarn; 768 MPa for the fabric; 117 MPa for the composite. The fracture probability of the yarn, fabric and composite was well fitted by the normal distribution function. The tensile strength of the composite was interpreted by the product of the effective fiber content, the Young's modulus of the fiber and elongation of the composite.

Effect of Cerium-Rich Mischmetal Content on the Mechanical Properties and Fracture Morphology of New 5XXX Series Aluminum Alloys

2012 ◽  
Vol 152-154 ◽  
pp. 239-243
Author(s):  
Hua Shen ◽  
He Liang ◽  
Guang Chun Yao ◽  
Wei Dong Yang ◽  
Xiao Dong Ren
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Aluminum Alloys ◽  
Fracture Morphology ◽  
Fracture Pattern ◽  
Preparation Process ◽  
Dimple Fracture ◽  
Properties Of Materials ◽  
Electronic Microscope ◽  
Morphology And Mechanical Properties

Preparation process of new 5XXX series aluminum alloys containing cerium-rich mischmetal wasintroduced .The effects of cerium-rich mischmetal on fracture morphology and mechanical properties of aluminium alloy were investigated in detail by scanning electronic microscope (SEM), and tensile test.The results show that alloys tensile strength and elongation with the increase of the content of mischmetal first increased, then down. When the mischmetal content is increased up to 0.30%, the tensile strength and elongation are 115 MPa and 25.9% respectively, meanwhile, the fractograph exhibited typical ductile dimple fracture pattern. Then the alloy performance is best. Mischmetal added into the alloy can improve the mechanical properties of materials, but too much mischmetal will induce the decrease in the material performance.Becase it may generate more the coarse Al11(Ce ,La)3particle.

scholarly journals Microstructural Characterization and Mechanical Property of Al-Li Plate Produced by Centrifugal Casting Method

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 966
Author(s):  
Qingle Tian ◽  
Kai Deng ◽  
Zhishuai Xu ◽  
Ke Han ◽  
Hongxing Zheng
Keyword(s):  
Centrifugal Casting ◽  
High Strength ◽  
Microstructural Characterization ◽  
Fracture Morphology ◽  
Total Elongation ◽  
Mechanical Anisotropy ◽  
Tensile Fracture ◽  
Casting Method ◽  
Scanning Calorimetry ◽  
Strengthening Phases

Using a centrifugal casting method, along with deformation and aging, we produced a high-strength, low-anisotropy Al-Li plate. The electron probe microanalysis, transmission electron microscope, differential scanning calorimetry, and X-ray diffraction were used to clarify the evolution of strengthening phases. Experimental results showed that centrifugal-cast Al-Li plate consisted of intragrain δ′—(Al,Cu)3Li precipitate and interdendritic θ′—Al2Cu particles. After cold-rolling to a reduction ratio of 60% and annealing at 800 K for 90 min, both primary θ′ and δ′ were dissolved in solid solution. Aging at 438 K for 60 h led to the formation of two kinds of precipitates (needle-like T1—Al2CuLi and spherical δ′ in two sizes), which acted as the main strengthening phases. The average values of ultimate tensile strength and yield strength for the anneal-aged plate reached 496 MPa and 408 MPa, with a total elongation of 3.9%. The anneal-aged plate showed mechanical anisotropy of less than 5%. The tensile fracture morphology indicated a typical intergranular fracture mode.

scholarly journals An experimental method to determine the intralaminar fracture toughness of high-strength carbon-fibre reinforced composite aerostructures

2018 ◽  
Vol 122 (1255) ◽  
pp. 1352-1370 ◽  
Author(s):  
H. Liu ◽  
B.G. Falzon ◽  
G. Catalanotti ◽  
W. Tan
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Crack Tip ◽  
Damage Mechanism ◽  
Calibration Method ◽  
Compact Tension ◽  
Tensile Fracture ◽  
High Tensile Strength ◽  
Physical Test ◽  
Area Method

ABSTRACTCarbon fibres with high tensile strength are being increasingly utilised in the manufacture of advanced composite aerostructures. A Modified Compact Tension (MCT) specimen is often deployed to measure the longitudinal intralaminar fracture toughness but a high tensile strength often leads to premature damage away from the crack tip. We present an approach whereby the MCT specimen is supported by external fixtures to prevent premature damage. In addition, we have developed a novel measurement technique, based on the fibre failure strain and C-scanning, to determine the crack length in the presence of surface sublaminate delamination which masks the crack tip location. A set of cross-ply specimens, with a ((90/0)s)4 layup, were manufactured from an IMS60/epoxy composite system Two different data reduction schemes, compliance calibration and the area method, are used to determine the fibre-dominated initiation and propagation intralaminar fracture toughness values. Propagation values of fracture toughness were measured at 774.9 ± 5.2% kJ/m2 and 768.5 ± 4.1% kJ/m2, when using the compliance calibration method and the area method, respectively. Scanning Electron Microscopy (SEM) is carried out on the fracture surface to obtain insight into the damage mechanism of high-tensile-strength fibre-reinforced unidirectional composites. The measured tensile fracture toughness value is used in a fully validated computational model to simulate the physical test.

Computer Simulation of Fracture in Brittle Polycrystalline Solids: Effect of Modulus Amisotropy

1992 ◽  
Vol 291 ◽  
Author(s):  
Shiun Ling ◽  
Michael P. Anderson
Keyword(s):  
Fracture Behavior ◽  
Careful Analysis ◽  
Fracture Morphology ◽  
Constitutive Relationship ◽  
Stress Distributions ◽  
Compliance Matrix ◽  
Spring Network Model ◽  
Polycrystalline Solids ◽  
D Model ◽  
Crystalline Symmetry

ABSTRACTA simulation procedure based on the spring network model has been developed for studying the fracture behavior in brittle, polycrystalline solids. In this 2-D model, the effect of crystalline symmetry is accounted for by imparting to individual bonds a constitutive relationship using the material compliance matrix. Using this model, it was found that the fracture morphology becomes more intragranular in nature with increasing modulus anisotropy. Careful analysis suggests that this is due to the wider stress distributions, and the resulting larger number of cracks generated in the interior of anisotropic grains.

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