Phase Transformation Behavior and Mechanical Properties of Ti-Mo-Sn Alloys

2013 ◽  
Vol 747-748 ◽  
pp. 855-859
Author(s):  
Xiao Xue Chen ◽  
Shun Guo ◽  
Xin Qing Zhao
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Cold Deformation ◽  
High Strength ◽  
Mechanical Tests ◽  
X Ray Diffraction ◽  
Superior Mechanical Properties ◽  
Low Modulus ◽  
Mo Content

A series of Ti-Mo-Sn alloys with different Mo contents from 7% to 15% (wt. %) were prepared, and the effects of Mo content and thermo-mechanical treatment on their microstructural evolution and mechanical behavior were investigated. The experimental results indicated that the β to α martensite transformation can be effectively suppressed with increasing Mo content. After cold rolling treatment, superior mechanical properties and low modulus were achieved in Ti-8Mo-4Sn alloy, with tensile strength of 1108MPa, yield strength of 1003MPa and low Youngs modulus of 53GPa. The influence of severe cold deformation on the macrostructure and mechanical properties was discussed based on the characterization of X-Ray diffraction and mechanical tests. It was demonstrated that the cold rolling induced fine α martensite and high density dislocations lead to the high strength of the Ti-Mo-Sn alloys. The fine α martensite as well as the β matrix with low stability guarantee low Youngs modulus.

Characterization of Microstructure in High Strength Microalloyed Steels Using Quantitative X-Ray Diffraction

2008 ◽  
Author(s):  
X. Li ◽  
J. B. Wiskel ◽  
H. Henein ◽  
D. G. Ivey ◽  
O. Omotoso
Keyword(s):  
Mechanical Properties ◽  
Rietveld Method ◽  
Domain Size ◽  
High Strength ◽  
Preferred Orientation ◽  
Microalloyed Steels ◽  
X Ray Diffraction ◽  
X Ray ◽  
X80 Steels

The mechanical properties of microalloyed steels used in pipelines are strongly affected by microstructure. In this paper, X-ray diffraction (Rietveld method) was used to quantify the microstructure — specifically domain size, microstrain and preferred orientation — for four X80 steels and three experimental X100 steels. Measurements were made at the surface and at several positions below the surface. Nano-sized domains were obtained for all steels tested. A smaller domain size, higher microstrain and stronger preferred orientation were observed in the X100 samples relative to the X80 steels.

scholarly journals Microstructure and mechanical properties of as-cast and annealed high strength low alloy steel

2019 ◽  
Vol 8 (4) ◽  
pp. 1
Author(s):  
Bárbara Ferreira de Oliveira ◽  
Michel Picanço Oliveira ◽  
Luis Augusto Hernandez Terrones ◽  
Márcia Giardinieri de Azevedo ◽  
Leonardo Barbosa Godefroid
Keyword(s):  
Mechanical Properties ◽  
Hsla Steel ◽  
Cast Steel ◽  
High Strength ◽  
Calcium Content ◽  
Casting Process ◽  
Mechanical Tests ◽  
Solidification Structure ◽  
Microstructure And Mechanical Properties

This paper presents a study on the microstructure and mechanical properties of a microalloyed HSLA steel solidified by continuous casting process and annealed at 1100 °C for 1 hour. The techniques of confocal microscopy, scanning electron microscopy and hardness, tensile and Charpy mechanical tests were used. The results of this research showed that the microstructure of the sample in the as-received condition was mainly composed of acicular ferrite and aggregates of ferrite and carbides. Non-metallic inclusion characterization of as-cast steel showed that calcium content was not enough to modify the morphology of some aluminates. After thermal treatment, the initial microstructure was transformed into polygonal ferrite and pearlite. In both conditions, different types of precipitates were found, which were classified according to their distribution in the microstructure. The steel with solidification structure showed a higher tensile strength, but its application would be unlikely in components that require good impact strength.

scholarly journals Synthesis and Characterization of Ni-P-Ti Nanocomposite Coatings on HSLA Steel

2020 ◽  
Author(s):  
Khuram Shahzad ◽  
Eman Mohamed Abdelkhalek Fayyad ◽  
Malik Adeel Umer ◽  
Osama Fayyaz ◽  
Tooba Qureshi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Oil And Gas ◽  
Composite Coatings ◽  
Hsla Steel ◽  
High Strength ◽  
Nanocomposite Coatings ◽  
Superior Mechanical Properties ◽  
P Matrix

Nickel phosphorus (Ni-P) coatings possess tailored mechanical and anticorrosion properties and have found applications in industries like automotive, oil and gas, electronics, and aerospace. Their properties can further be enhanced by incorporating nanoparticles into their (Ni-P) matrix. In the present study, Ni-P-Ti nanocomposite coatings have been developed on high strength low alloy steel (HSLA) through electroless deposition technique. For this purpose, various concentrations of titanium (Ti) nanoparticles are used in the deposition bath containing 0.0g/L, 0.25g/L, 0.5g/L, 0.75g/L, and 1.0g/L nanoparticles. XDR, SEM, microhardness, and nanoindentation have been carried out to elucidate the role of Ti nanoparticle concertation on the microstructure and mechanical properties of the Ni-P-Ti composite coatings. XRD and EDX results confirm the incorporation of nanoparticles into the Ni-P matrix during deposition processing. SEM and AFM results exhibit the formation of a dense, uniform coating without any observable defects. An increase in the mechanical properties of the Ni-P matrix was observed by the addition of Ti nanoparticles. Superior mechanical properties were shown by the samples containing 0.5g/L Ti nanoparticle concentration. Improvement in the structural, as well as mechanical properties of Ni- P matrix by the addition of Ti, confirms the suitability of Ni-P-Ti composite coatings for various engineering applications.

Effect of Stacking Fault Energy on the Mechanical Properties of Cold-Rolling Cu and Cu-Al-Zn Alloys

2011 ◽  
Vol 399-401 ◽  
pp. 708-712
Author(s):  
Lian Ping Cheng ◽  
Xiao Guang Liang ◽  
Xing Yuan San ◽  
Yu Lan Gong ◽  
Xin Kun Zhu
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
High Strength ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
X Ray Diffraction ◽  
Peak Broadening ◽  
Energy Lowering ◽  
The Relationship ◽  
Zn Alloys

Sacking fault energy (SFE) plays a significant role for metals or alloys to getting high strength and expected ductility simultaneously. Here the effect of SFE variation on mechanical properties has been studied in cold-rolling Cu and Cu-Al-Zn alloys. Tensile testing results show that the strength and ductility of the materials increase simultaneously with decreasing SFE. X-ray diffraction measurements indicate the peak broadening for the crystallite size decreasing and the lattice strain increasing with the stacking fault energy lowering . The relationship between the microstructure and mechanical properties of the materials is briefly discussed in this paper.

scholarly journals Mechanical Characterization of Aluminium-Silicon-Titanium Diboride (Al-Si-TiB2) Reinforced by Scandium (Sc) and Strontium (Sr)

2019 ◽  
Vol 7 (4.14) ◽  
pp. 392
Author(s):  
N. N.A. Basir ◽  
N. H. Mustafa ◽  
R. E. Ibrahim ◽  
R. Rosmamuhamadani ◽  
M. M. Mahat ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Titanium Diboride ◽  
High Strength ◽  
Matrix Composites ◽  
Composite Alloy ◽  
X Ray Diffraction ◽  
Hardness Tester ◽  
And Performance

Aluminium based metal matrix composites (MMCs) have better properties and performance. They are commonly used in transport applications which require combinations of high strength and ductility. They are quite attractive due to their low density, capability to be strengthened by precipitation, good corrosion resistance, high thermal and electrical conductivity. Grain refinement plays a crucial role in improving characteristics and properties of aluminium-silicon (Al-Si) alloy. In this investigation, scandium (Sc) and strontium (Sr) elements were added to aluminium-silicon-titanium diboride (Al-Si-TiB2) alloy for refinement of grains. The compositions of 93 wt.% Al-Si, 6 wt.% TiB2, 0.5 wt.% Sc and 0.5 wt.% Sr were melted into induction furnace. Then the composites have been characterized on the mechanical properties and microstructure characterization. Instron tensile machine and vickers hardness tester were used to characterize the mechanical properties of the composite alloy. Microstructure and phase composition were characterized by Field Emission Scanning Electron Microscope (FESEM) and X-ray Diffraction (XRD). From the results obtained, addition of Sc and Sr, into Al-S-TiB2 improved the tensile strength and hardness of composite alloy. Results also showed that the inoculants addition able to enhance the refinement of grains and escalate the values of hardness and tensile strength of Al-Si-TiB2 composite. Mechanical properties related much on the microstructure as it can be seen that the addition of grain refiners produced much higher value of mechanical properties.  

Synthesis and Characterization of Porous ZrO2-Y2O3-TiO2 Ceramics Prepared by Coprecipitation

2012 ◽  
Vol 727-728 ◽  
pp. 1387-1392 ◽  
Author(s):  
Luan M. Medeiros ◽  
Fernando S. Silva ◽  
Juliana Marchi ◽  
Walter Kenji Yoshito ◽  
Dolores Ribeiro Ricci Lazar ◽  
...  
Keyword(s):  
Ceramic Composite ◽  
High Strength ◽  
Ceramic Composites ◽  
Rice Starch ◽  
X Ray Diffraction ◽  
Zirconia Ceramics ◽  
Pore Former ◽  
X Ray ◽  
Cold Pressed

Zirconium dioxide (zirconia) ceramics are known by its high strength and toughness and titanium dioxide (titania) ceramics has outstanding surface properties. The ceramic composite formed between the two oxides are expected to have advantages of both ceramics, especially when its surface area is increased by pores. In this work, ceramic composites of ZrO2-Y2O3-TiO2were synthesized by coprecipitation and rice starch was added as pore former in 10, 20 and 30 wt%. Powders were cold pressed as cylindrical pellets and sintered at 1500 °C for 01 hour and ceramics were characterized by techniques as Archimedes method for density measurements, X-ray diffraction and scanning electron microscopy. Results showed that pores are inhomogeneously distributed through ceramic bodies.

scholarly journals Fabrication and Characterization of Electrospun Polycaprolactone Blended with Chitosan-Gelatin Complex Nanofibrous Mats

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Yongfang Qian ◽  
Zhen Zhang ◽  
Laijiu Zheng ◽  
Ruoyuan Song ◽  
Yuping Zhao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Weight Ratio ◽  
Degree Of Crystallinity ◽  
X Ray Diffraction ◽  
Tissue Engineering Scaffolds ◽  
Elongation At Break ◽  
Nanofibrous Scaffolds ◽  
Two Peaks

Design and fabrication of nanofibrous scaffolds should mimic the native extracellular matrix. This study is aimed at investigating electrospinning of polycaprolactone (PCL) blended with chitosan-gelatin complex. The morphologies were observed from scanning electron microscope. As-spun blended mats had thinner fibers than pure PCL. X-ray diffraction was used to analyze the degree of crystallinity. The intensity at two peaks at 2θof 21° and 23.5° gradually decreased with the percentage of chitosan-gelatin complex increasing. Moreover, incorporation of the complex could obviously improve the hydrophilicity of as-spun blended mats. Mechanical properties of as-spun nanofibrous mats were also tested. The elongation at break of fibrous mats increased with the PCL content increasing and the ultimate tensile strength varied with different weight ratios. The as-spun mats had higher tensile strength when the weight ratio of PCL to CS-Gel was 75/25 compared to pure PCL. Both as-spun PCL scaffolds and PCL/CS-Gel scaffolds supported the proliferation of porcine iliac endothelial cells, and PCL/CS-Gel had better cell viability than pure PCL. Therefore, electrospun PCL/Chitosan-gelatin nanofibrous mats with weight ratio of 75/25 have better hydrophilicity mechanical properties, and cell proliferation and thus would be a promising candidate for tissue engineering scaffolds.

Exploitation Load Impact on Electrochemical Properties of Shipbuilding 7xxx Series Aluminum Alloy Joints Prepared with TIG and FSW Methods

2015 ◽  
Vol 236 ◽  
pp. 53-61
Author(s):  
Wojciech Jurczak
Keyword(s):  
Mechanical Properties ◽  
Corrosion Potential ◽  
Tensile Load ◽  
Electrochemical Corrosion ◽  
High Strength ◽  
Shipbuilding Industry ◽  
Friction Stir ◽  
Superior Mechanical Properties ◽  
Series Aluminum Alloy ◽  
Joint Quality

The paper presents the results of investigations on mechanical properties and electrochemical potential distribution within arc welded (TIG) and friction stir welded (FSW) joints subjected to slow strain rate tests. The materials investigated were high-strength 7xxx series (7020 and its modification 7020M) aluminum alloys intended for shipbuilding. The objectives were joint quality assessment and comparison of the advantages of new FSW method with the traditional TIG methods commonly utilized in shipbuilding industry. Joint quality was evaluated based on mechanical investigations, hardness distribution tests and simultaneous electrochemical corrosion potential measurements at various locations within the welded joints.Initiation of corrosion processes on TIG and FSW joints was identified as a radical decrease in corrosion potential related to load followed by oxide layer cracking. Arc welded (TIG) joints of 7xxx series alloys undergo corrosion at lower values of tensile load applied as compared to the FSW joints. Superior mechanical properties and higher corrosion resistance of the FSW joints make this technology well-suited for joining high-strength 7xxx series alloys.

Effect of Heat Setting Methods on Structures and Properties of High Strength Polyvinyl Alcohol Fibre

2015 ◽  
Vol 815 ◽  
pp. 643-648
Author(s):  
Yin Zhu ◽  
Jiong Xin Zhao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Polyvinyl Alcohol ◽  
Setting Time ◽  
High Strength ◽  
Single Fibre ◽  
X Ray Diffraction ◽  
Heat Setting ◽  
Heat Treated ◽  
Setting Process

The effect of heat setting methods on the structures and mechanical properties of high strength polyvinyl alcohol (PVA) fibre is studied in this article. The microstructure and mechanical properties of heat treated PVA fibre is investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and single fibre electronic tensile strength tester. Results show that the heat setting method with constant tension is a good heat setting method which can largely enhance the tensile strength of PVA fibre. During the heat setting process, the mechanical properties of PVA fibre are greatly affected by the temperature, tension and setting time. When the temperature is 220°C, tension is 5cN/dtex and setting time is 90sec, the tensile strength of PVA fibre increases from 12.0cN/dtex to 16.4cN/dtex in compare with the PVA fibre without heat setting

CHARACTERIZATION OF HYDROXYAPATITE/TI6AL4V COMPOSITE POWDER UNDER VARIOUS SINTERING TEMPERATURE

2015 ◽  
Vol 75 (7) ◽  
Author(s):  
Amir Arifin ◽  
Abu Bakar Sulong ◽  
Norhamidi Muhamad ◽  
Junaidi Syarif
Keyword(s):  
Mechanical Properties ◽  
Composite Powder ◽  
Sintering Temperature ◽  
Physical And Mechanical Properties ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Different Temperatures ◽  
Two Phases ◽  
Work Interaction

Hydroxyapatite (HA) has been widely used in biomedical applications due to its excellent biocompatibility. However, Hydroxyapatite possesses poor mechanical properties and only tolerate limited loads for implants. Titanium is well-known materials applied in implant that has advantage in mechanical properties but poor in biocompatibility. The combination of the Titanium alloy and HA is expected to produce bio-implants with good in term of mechanical properties and biocompatabilty. In this work, interaction and mechanical properties of HA/Ti6Al4V was analyzed. The physical and mechanical properties of HA/Ti6Al4V composite powder obtained from compaction (powder metallurgy) of 60 wt.% Ti6Al4V and 40 wt.% HA and sintering at different temperatures in air were investigated in this study. Interactions of the mixed powders were investigated using X-ray diffraction. The hardness and density of the HA/Ti6Al4V composites were also measured. Based on the results of XRD analysis, the oxidation of Ti began at 700 °C. At 1000 °C, two phases were formed (i.e., TiO2 and CaTiO3). The results showed that the hardness HA/Ti6Al4V composites increased by 221.6% with increasing sintering temperature from 700oC to 1000oC. In contrast, the density of the composites decreased by 1.9% with increasing sintering temperature. 

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