scholarly journals Microstructure and Tensile Properties of Graphene-Oxide-Reinforced High-Temperature Titanium-Alloy-Matrix Composites

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3358 ◽  
Author(s):  
Hang Chen ◽  
Guangbao Mi ◽  
Peijie Li ◽  
Xu Huang ◽  
Chunxiao Cao
Keyword(s):  
Tensile Strength ◽  
Titanium Alloy ◽  
Graphene Oxide ◽  
High Temperature ◽  
Yield Strength ◽  
Room Temperature ◽  
Second Phase ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
The Matrix

In this study, graphene-oxide (GO)-reinforced Ti–Al–Sn–Zr–Mo–Nb–Si high-temperature titanium-alloy-matrix composites were fabricated by powder metallurgy. The mixed powders with well-dispersed GO sheets were obtained by temperature-controlled solution mixing, in which GO sheets adsorb on the surface of titanium alloy particles. Vacuum deoxygenating was applied to remove the oxygen-containing groups in GO, in order to reduce the introduction of oxygen. The compact composites with refined equiaxed and lamellar α phase structures were prepared by hot isostatic pressing (HIP). The results show that in-situ TiC layers form on the surface of GO and GO promotes the precipitation of hexagonal (TiZr)6Si3 particles. The composites exhibit significant improvement in strength and microhardness. The room-temperature tensile strength, yield strength and microhardness of the composite added with 0.3 wt% GO are 9%, 15% and 27% higher than the matrix titanium alloy without GO, respectively, and the tensile strength and yield strength at 600 °C are 3% and 21% higher than the matrix alloy. The quantitative analysis indicates that the main strengthening mechanisms are load transfer strengthening, grain refinement and (TiZr)6Si3 second phase strengthening, which accounted for 48%, 30% and 16% of the improvement of room-temperature yield strength, respectively.

Effect of High Temperature Caliber Rolling on Microstructure and Room Temperature Tensile Properties of Mg-3Al-1Zn (AZ31) Alloy

2013 ◽  
Vol 209 ◽  
pp. 6-9 ◽  
Author(s):  
Rajendra Doiphode ◽  
S.V.S. Narayana Murty ◽  
Nityanand Prabhu ◽  
Bhagwati Prasad Kashyap
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Yield Strength ◽  
Strain Rate ◽  
Tensile Properties ◽  
Room Temperature ◽  
Tensile Tests ◽  
Az31 Alloy ◽  
Rolling Temperature ◽  
Grain Sizes

Mg-3Al-1Zn (AZ31) alloy was caliber rolled at 250, 300, 350, 400 and 450 °C. The effects of caliber rolling temperature on the microstructure and tensile properties were investigated. The room temperature tensile tests were carried out to failure at a strain rate of 1 x 10-4s-1. The nature of stress-strain curves obtained was found to vary with the temperature employed in caliber rolling. The yield strength and tensile strength followed a sinusoidal behaviour with increasing caliber rolling temperature but no such trend was noted in ductility. These variations in tensile properties were explained by the varying grain sizes obtained as a function of caliber rolling temperature.

scholarly journals Laser Oscillating Welding of TC31 High-Temperature Titanium Alloy

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1185
Author(s):  
Zhimin Wang ◽  
Lulu Sun ◽  
Wenchao Ke ◽  
Zhi Zeng ◽  
Wei Yao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Titanium Alloy ◽  
High Temperature ◽  
Laser Welding ◽  
Room Temperature ◽  
Base Material ◽  
Aerospace Applications ◽  
Weld Appearance ◽  
Laser Welds

The joining of high-temperature titanium alloy is attracting much attention in aerospace applications. However, the defects are easily formed during laser welding of titanium alloys, which weakens the joint mechanical properties. In this work, laser oscillating welding was applied to join TC31 high-temperature titanium alloy. The weld appearance, microstructure and mechanical properties of the laser welds were investigated. The results show that sound joints were formed by using laser oscillating welding method, and a large amount of martensite was presented in the welds. High mechanical properties were achieved, which was approaching to (or even equaled) the strength of the base material. The joints exhibited a tensile strength of up to 1200 ± 10 MPa at room temperature and 638 ± 6 MPa at 923 K. Laser oscillating welding is beneficial to the repression of porosity for welding high-temperature titanium alloy.

Investigation of NiAl–TiB2in situcomposites

1997 ◽  
Vol 12 (4) ◽  
pp. 1083-1090 ◽  
Author(s):  
J. T. Guo ◽  
Z. P. Xing
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Hot Pressing ◽  
Room Temperature ◽  
Tensile Yield Strength ◽  
Matrix Composites ◽  
Orientation Relationships ◽  
The Matrix ◽  
Atomically Flat ◽  
Nial Matrix

A hot-pressing aided exothermic synthesis (HPES) technique to fabricate NiAl matrix composites containing 0 and 20 vol.% TiB2 particles was developed. The conversion of mixtures of elements to the product was complete after processing, and TiB2 particles in the matrix were uniformly dispersed. The microstructure and interfaces were very thermally stable. The interfaces between NiAl and TiB2 were atomically flat, sharp, and generally free from interfacial phases. In some cases, however, thin amorphous layers existed at NiAl/TiB2 interfaces. At least three kinds of orientation relationships between TiB2 and NiAl were observed. The compressive yield strengths at room temperature and at 1000 °C of the composite were approximately three times as strong as those of the unreinforced NiAl. The tensile yield strength at 980 °C of the composite was about three times stronger than that of NiAl. The ambient fracture toughness of the composite was slightly greater than that of the monolithic NiAl.

Development of a Low Cost Process for Manufacturing of Ti-MMC by Roll-Diffusion-Bonding

2010 ◽  
Vol 638-642 ◽  
pp. 991-996 ◽  
Author(s):  
Claudio Testani ◽  
F. Ferraro
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Diffusion Bonding ◽  
Pilot Plant ◽  
Low Cost ◽  
Thermal Spraying ◽  
Tensile Tests ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Metallographic Examination

Titanium-alloy matrix composites (TMC) are nowadays one of the material class with the highest specific resistance from room temperature up to 800° C. Centro Sviluppo Materiali SpA (CSM) efforts have been focused on the developing of an innovative solution to reduce the process costs. The new approach consists in an experimental “diffusion bonding” plant for co-rolling at high temperature sheets of titanium alloy and silicon carbide monofilaments fabrics. The result is a process cost reduction of about 40% respect to HIP process. The experimental pilot plant has been proposed for patent with n° 2006A000261 on may 2006. This paper describes the pilot plant and the process results. The metallographic examination on products shows full bonded samples (100 mm wide and 1500 mm long) obtained in a work field that is at least 100 times faster than that of HIP. High temperature tensile tests have been carried on Roll Diffusion Bonded specimens and the results are reported in comparison with those obtained by Isostatic Pressing (HIP) and Thermal- Spraying (TS) processes on the same composite.

Microstructure and Mechanical Bevavior of Ni3Al-Matrix Composites

1990 ◽  
Vol 194 ◽  
Author(s):  
P. C. Brennan ◽  
W. H. Kao ◽  
S. M. Jeng ◽  
J.-M. Yang
Keyword(s):  
Yield Strength ◽  
Nickel Aluminide ◽  
Fracture Stress ◽  
Room Temperature ◽  
Hot Extrusion ◽  
Matrix Composites ◽  
The Matrix ◽  
Bend Tests ◽  
Point Bend ◽  
Particulate Reinforced

AbstractAn aluminum oxide particulate-reinforced nickel-aluminide composite was fabricated by vacuum hot pressing and hot extrusion. Room temperature three point bend tests were conducted after 1 and 100 h at 1000 °C. The composite exhibited a decrease in yield strength from 772 to 517 MPa after 100 h while the ultimate fracture stress decreased from 1174 to 998 MPa. The strain to failure increased from 4.6% to 6.0% after the same exposure. Saphikon single crystal Al2O3 fibers were used to demonstrate the materials' compatibility. The fracture surfaces of the failed composites indicated ductile failures in the matrix and decohesion between the particles and matrix.

Investigation on the Microstructure and Mechanical Properties of T23 Steel during High Temperature Aging

2020 ◽  
Vol 993 ◽  
pp. 575-584
Author(s):  
Bao Liang Shi ◽  
Chao Zhang ◽  
Yao Wen Tang ◽  
Guo Jie Wei ◽  
Yan Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
High Temperature ◽  
Yield Strength ◽  
Aging Time ◽  
Size Increase ◽  
Microstructure And Mechanical Properties ◽  
The Matrix ◽  
High Temperature Aging ◽  
Temperature Aging

The changes of the microstructure and mechanical properties of T23 steel were investigated during high temperature aging at 625 °C up to 3000 h. The results showed that the bainitic lath microstructure first decreased and then totally disappeared with the increase of aging time, the size of the carbides gradually increased and the recovery occurred after aging for 1000 h. The contents of W, Mo elements in the matrix after aging for 3000 h were remarkably decreased by 27.6% and 45% compared with the as-received state. However, no M6C carbides formed in spite of the obvious desolution transformation of W, Mo. Both the yield strength and the tensile strength at room and high temperature were decreased with the increase of aging time at 625 °C, and the tensile strength at high temperature after aging for 3000 h exhibited the largest of decline compared with the as-received state. The main reasons for the decrease of the mechanical properties related to the microstructure variations, such as the size increase of the M23C6 carbides, the dissolution of the bainite lath microstructure and the occurrence of the recovery. Meanwhile, the desolution of W, Mo elements plays an important role in the decrease of the mechanical properties.

Microstructure and Properties of In-Situ Synthesized (Al3Zr+Al2O3)p/A356 Composites

2003 ◽  
Vol 17 (08n09) ◽  
pp. 1292-1296 ◽  
Author(s):  
Y. T. Zhao ◽  
Q. X. Dai ◽  
X. N. Cheng ◽  
S. C. Sun
Keyword(s):  
Tensile Strength ◽  
Crystal Surface ◽  
Reaction System ◽  
A356 Alloy ◽  
Maximum Size ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Growth Phenomenon ◽  
The Matrix

A novel in-situ reaction system Al-Zr-O was developed. In-situ Al3Zr and Al 2 O 3 particulate reinforced A356 alloy matrix composites have been fabricated by direct melt reaction method. The results show that the maximum size of Al3Zr and Al 2 O 3 particulate synthesized in the system ZrOCl2-A356 is 1um and 3um respectively, and they are well distributed in the matrix. The investigation shows that Al3Zr crystal is in the shape of polyhedron and rectangle. There is a faceted growth phenomenon on Al3Zr crystal surface. It is firstly found that the Al3Zr crystal grows in the mechanism of twin. The twin plane is [Formula: see text], and the twinning direction is [Formula: see text]. The crystal morphology of in-situ[Formula: see text] particulate is rectangle or sphere. Furthermore. ( Al 3 Zr+Al 2 O 3) p / A356 composites have not only higher tensile strength at room temperature (376.2MPa) but also higher yield strength (319.4MPa) and higher tensile strength at elevated temperature (200°C) than that of A356 alloy.

Development of Ni-Nb-Ta Metallic Glass Particle Reinforced Al Based Matrix Composites

2005 ◽  
Vol 475-479 ◽  
pp. 3427-3430 ◽  
Author(s):  
Myung Hyun Lee ◽  
J.H. Kim ◽  
J.S. Park ◽  
Won Tae Kim ◽  
Do Hyang Kim
Keyword(s):  
Yield Strength ◽  
Metallic Glass ◽  
Casting Process ◽  
Glass Particle ◽  
Mg Alloy ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
The Matrix

Metallic glass particle reinforced Al-6.5Si-0.25Mg (wt%) alloy matrix composites have been fabricated using infiltration casting process. The Al-Si-Mg alloy melt infiltrates into the porous Ni-Nb-Ta metallic glass pre-form by applying the pressure. The Ni60Nb20Ta20 metallic glass particles are homogeneously distributed in the matrix. The composite exhibits higher yield strength than the monolithic Al-6.5Si-0.25Mg (wt%) alloy.

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