Microstructure Evolution of PtTi0.5Zr0.2/Ti Laminated Composites Synthesized by Hot Pressing and Rolling

2015 ◽  
Vol 815 ◽  
pp. 656-660
Author(s):  
Ye Fan ◽  
Xiao Ge Zhang ◽  
Qiong Zhao ◽  
Guo Yi Qin ◽  
Si Yong Xu ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Tensile Strength ◽  
Intermetallic Compound ◽  
Microstructure Evolution ◽  
Hot Pressing ◽  
Laminated Composites ◽  
Laminated Composite ◽  
Rolling Process ◽  
Tensile Fracture ◽  
Layer Structures

The PtTi0.5Zr0.2/Ti laminated composite was prepared by hot pressing and rolling process. Microstructure, interlaminar spacing and mechanical property of the microlaminated composites after rolling were evaluated. The results showed that the layer structures of laminated composites remained consecutiveness with 93% deformation. The 12μm PtTi0.5Zr0.2 layer and 8μm Ti layer was observed finally, as well as the intermetallic compound Ti3Pt making the PtTi0.5Zr0.2 layer and Ti layer connect with each other. Compared with Platinum and Titanium, the tensile strength of PtTi0.5Zr0.2/Ti laminated composite was enhanced by approximately 59% and 29% respectively and reached 657MPa. The tensile fracture was more uniform and showed a more coordinated process.

scholarly journals Microstructure Characterization and Mechanical Property of Mg/Al Laminated Composite Prepared by the Novel Approach: Corrugated + Flat Rolling (CFR)

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 690 ◽  
Author(s):  
Tao Wang ◽  
Sha Li ◽  
Zhongkai Ren ◽  
Yi Jia ◽  
Wenshi Fu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Rolling Direction ◽  
Laminated Composite ◽  
Rolling Process ◽  
Interfacial Microstructure ◽  
Rolled Sample ◽  
Novel Approach ◽  
Flat Rolling ◽  
Interfacial Intermetallic Compounds

In this paper, Mg/Al laminated composites were successfully prepared at 400 °C by corrugated + flat rolling (CFR) with reduction ratios of 35% and 25% and subsequent annealing treatments were conducted at 200–350 °C for 30 min. A two-dimensional model was established to analyze the strain distribution during the first corrugated rolling process. Simulation results indicated that severe plastic deformation was formed at trough positions, which included more numerous refined grains than in the peak positions. The interfacial microstructure and mechanical property of the flattened composites along the rolling direction (RD) and the transverse direction (TD) were investigated. The results revealed that longitudinal discontinuous and transverse continuous interfacial intermetallic compounds (IMCs) were observed of the flattened as-rolled sample. Spatial distribution was provided for the grain microstructure along the thickness and rolling direction for AZ31B magnesium alloys of the CFR as-rolled composite. Mechanical property results showed that the longitudinal ultimate tensile strength (UTS) and elongation (EL) of the as-rolled sample reached 255 MPa and 4.14%, respectively. The as-rolled UTS along TD reached 325 MPa, about 30% higher than that along the RD. After heat treatment, the anisotropy of mechanical properties remained. The microstructure evolution and mechanical properties were discussed in detail.

Study on Season Factor in the Preparation of PVA/RS Composite

2014 ◽  
Vol 881-883 ◽  
pp. 1171-1174
Author(s):  
Chuan Bao Wu
Keyword(s):  
Tensile Strength ◽  
Rice Straw ◽  
Hot Pressing ◽  
Vinyl Alcohol ◽  
Tensile Fracture ◽  
Poly Vinyl Alcohol ◽  
Comparison Results ◽  
Winter Sample ◽  
Summer Sample

The effect of season factor on the performances of poly (vinyl alcohol)/rice straw (PVA/RS) composites prepared by hot-pressing was studied. Two forms of RS, including shortcut RS and RS wires, were used to prepare composite. For PVA/ shortcut RS composites, samples of winter showed higher tensile strength and strength at tensile fracture at different PVA contents than that of summer. When PVA content is 50%, tensile strength of winter sample is 136% higher than that of summer sample and strength at tensile fracture of winter sample is 320% higher than that of summer sample. In addition, samples of winter showed lower tensile stretch and higher hardness at different PVA contents than that of summer. For PVA/RS wire composites, the comparison results are similar. These indicated that season is an important factor for preparing plant based composite with PVA as adhesive.

scholarly journals Effect of Transition Layer on Properties of Tungsten-Tantalum (W-Ta) Laminated Composite

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 558
Author(s):  
Zizhi Yan ◽  
Gaoyong Xu ◽  
Jinping Suo
Keyword(s):  
Transition Layer ◽  
Laminated Composites ◽  
Laminated Composite ◽  
High Strength ◽  
Fracture Morphology ◽  
Bending Test ◽  
Tensile Fracture ◽  
Transition Layers ◽  
Three Point Bending ◽  
Plasma Sintering

Tungsten has many attractive properties, but its brittleness limits its application. Our team has found that the brittleness of tungsten can be greatly improved by combining the brittle tungsten with tantalum. Furthermore, we found that if a suitable transition layer is added between tungsten and tantalum, the properties of the composite will be further improved. In this paper, we studied the effect of different transition layers on the properties of W-Ta laminated composite to explore a suitable transition layer, which can effectively improve the toughness of the composite and solve the problem of tungsten application. We have prepared four kinds of W-Ta laminated composites with Ni, Ti, Nb, and Mo as transition layers. Ta-W laminated composites were prepared by stacking layers with Ta, transition layer, W alternately and sintered by spark plasma sintering (SPS). The tensile and three-point bending tests were carried to compare the mechanical properties. The tensile fracture morphology and three-point bending crack distribution were observed by SEM. In addition, the diffusion of elements in the transition layer and the influence of element diffusion on the tungsten structure were also studied to clarify the toughening mechanism. The results show that Nb is a satisfying transition layer, which not only improves the strength of W-Ta laminated composite, but also improves the toughness. The tensile test of W/Nb/Ta laminated composite shows a typical plastic fracture mode with an elongation of 13%. Three-point bending test also shows high strength and good toughness. In addition, Voigt model was used to predict the elastic modulus of W-Ta laminated composites and compared with the experimental results.

Experimental Researches on Temperature-Dependent Tensile Properties of Laminated Resin Composites Reinforced by Plain Woven Fabric

2010 ◽  
Vol 33 ◽  
pp. 119-122
Author(s):  
Guang Wei Chen ◽  
Jia Lu Li ◽  
G.F. He
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Tensile Property ◽  
Room Temperature ◽  
Laminated Composites ◽  
Tensile Load ◽  
Laminated Composite ◽  
Tensile Tests ◽  
Woven Fabric ◽  
Resin Composites

The purpose of this paper is to investigate the tensile property of laminated resin composites reinforced by carbon fiber plain woven fabric at relatively high temperature. For this purpose, the tensile tests of laminated resin composites are carried out at room temperature(20°C) and high temperature(150°C and 180°C). The effect rules of different temperature on the tensile property of these composites are discussed. The reasons for the variations of tensile property of these composites at different temperature are also analyzed. At 150 °C and 180 °C, the tensile strength of laminated composite decreased by 13.3% and 34.42% respectively, compared with that at room temperature, which shows that the tensile strength of resin laminated composites is sensitive at high temperature. The reason of the tensile strength of resin laminated composites declined at high temperature is that resin has been damaged and can not transfer tensile load, which makes resin and fiber can not bear the tensile load together at high temperature. The research results will provide a basic reference for the application of plain woven fabric reinforced resin laminated composites at room temperature to 180°C.

An Environmentally Friendly Composite Composed of Short-Cut Grass and Starch

2014 ◽  
Vol 525 ◽  
pp. 3-6
Author(s):  
Chuan Bao Wu ◽  
Xiang Hui Zeng
Keyword(s):  
Tensile Strength ◽  
Hot Pressing ◽  
Raw Materials ◽  
Environmentally Friendly ◽  
Tensile Fracture ◽  
Water Medium ◽  
Pressing Temperature ◽  
Pressing Method ◽  
Pressing Time ◽  
Processing Factors

Short-cut grass and starch were selected as raw materials to prepare environmentally friendly composite by hot-pressing method. Results indicated that short-cut grass and starch were easily mixed uniformly by water medium and adapt to hot-pressing process. Hot-pressing time and hot-pressing temperature influenced the performances of composites. The strength and elongation first increase and then decrease with the increase of two processing factors. Tensile strength and strength at fracture reach 2.3 MPa and 1.2 MPa respectively when hot-pressing was performed at 140 °C for 10 min. The tensile strength is always higher than strength at tensile fracture and the elongation at fracture is always higher than that at maximum force. This indicates that the fracture of composite is ductile fracture. The hardness of composite is uneven. Long hot-pressing time resulted in not too obvious decrease of hardness.

Composite of Shortcut Grass and Poly(vinyl alcohol): Preparation and Performance

2014 ◽  
Vol 881-883 ◽  
pp. 1179-1182
Author(s):  
Chuan Bao Wu ◽  
Yu Jun Zhou
Keyword(s):  
Tensile Strength ◽  
Hot Pressing ◽  
Vinyl Alcohol ◽  
Raw Materials ◽  
Raw Material ◽  
Tensile Fracture ◽  
Poly Vinyl Alcohol ◽  
Pressing Temperature ◽  
Pressing Method ◽  
And Performance

The environmentally friendly composite of poly (vinyl alcohol) (PVA) and shortcut grass were prepared by hot-pressing method. First, dry grass was cut into 1.5 cm long segments. Then, shortcut grass was mixed with PVA by using water as medium. The mixed uniformly raw materials were hot-pressed at different temperatures for different times. The effects of raw material ratio, hot-pressing temperature and hot-pressing temperature on composites performance were studied. Results showed that composites tensile strength increases with the increase of PVA content. Tensile strength reaches 3.59 MPa at 50% of PVA content. The tensile fracture stretch increases with PVA content and reaches 25.28% when PVA content is 50%. The tensile strength first increases and then decreases with the increase of hot-pressing temperature and hot-pressing temperature. The hardness of composite is uneven. Hardness at 20% of PVA content is lower slightly than that at other PVA contents.

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.

scholarly journals Comparative study of elastic properties and mode I fracture energy of carbon nanotube/epoxy and carbon fibre/epoxy laminated composites

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Jyotikalpa Bora ◽  
Sushen Kirtania
Keyword(s):  
Carbon Nanotube ◽  
Carbon Fibre ◽  
Fracture Energy ◽  
Elastic Properties ◽  
Volume Fraction ◽  
Laminated Composites ◽  
Laminated Composite ◽  
Fe Analysis ◽  
Mode I ◽  
Mode I Fracture

Abstract A comparative study of elastic properties and mode I fracture energy has been presented between conventional carbon fibre (CF)/epoxy and advanced carbon nanotube (CNT)/epoxy laminated composite materials. The volume fraction of CNT fibres has been considered as 15%, 30%, and 60% whereas; the volume fraction of CF has been kept constant at 60%. Three stacking sequences of the laminates viz.[0/0/0/0], [0/90/0/90] and [0/30/–30/90] have been considered in the present analysis. Periodic microstructure model has been used to calculate the elastic properties of the laminated composites. It has been observed analytically that the addition of only 15% CNT in epoxy will give almost the same value of longitudinal Young’s modulus as compared to the addition of 60% CF in epoxy. Finite element (FE) analysis of double cantilever beam specimens made from laminated composite has also been performed. It has been observed from FE analysis that the addition of 15% CNT in epoxy will also give almost the same value of mode I fracture energy as compared to the addition of 60% CF in epoxy. The value of mode I fracture energy for [0/0/0/0] laminated composite is two times higher than the other two types of laminated composites.

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