scholarly journals CNTs/TiC Reinforced Titanium Matrix Nanocomposites via Powder Metallurgy and Its Microstructural and Mechanical Properties

2008 ◽  
Vol 2008 ◽  
pp. 1-4 ◽  
Author(s):  
Katsuyoshi Kondoh ◽  
Thotsaphon Threrujirapapong ◽  
Hisashi Imai ◽  
Junko Umeda ◽  
Bunshi Fugetsu
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Pure Titanium ◽  
Multiwall Carbon Nanotubes ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Dispersion Strengthening ◽  
Titanium Matrix ◽  
Wet Process ◽  
Plasma Sintering

By using pure titanium powder coated with unbundled multiwall carbon nanotubes (MWCNTs) via wet process, powder metallurgy (P/M) titanium matrix composite (TMC) reinforced with the CNTs was prepared by spark plasma sintering (SPS) and subsequently hot extrusion process. The microstructure and mechanical properties of P/M pure titanium and reinforced with CNTs were evaluated. The distribution of CNTs and in situ formed titanium carbide (TiC) compounds during sintering was investigated by optical and scanning electron microscopy (SEM) equipped with EDS analyzer. The mechanical properties of TMC were significantly improved by the additive of CNTs. For example, when employing the pure titanium composite powder coated with CNTs of 0.35 mass%, the increase of tensile strength and yield stress of the extruded TMC was 157 MPa and 169 MPa, respectively, compared to those of extruded titanium materials with no CNT additive. Fractured surfaces of tensile specimens were analyzed by SEM, and the uniform distribution of CNTs and TiC particles, being effective for the dispersion strengthening, at the surface of the TMC were obviously observed.

Microstructural and Mechanical Properties of Titanium Matrix Composites Reinforced with Nano Carbon Materials via Powder Metallurgy Process

2009 ◽  
Vol 618-619 ◽  
pp. 495-499 ◽  
Author(s):  
Katsuyoshi Kondoh ◽  
Thotsaphon Threrujirapapong ◽  
Junko Umeda ◽  
Hisashi Imai ◽  
Bunshi Fugetsu
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Pure Titanium ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Matrix Composites ◽  
Dispersion Strengthening ◽  
Titanium Matrix ◽  
Wet Process ◽  
Plasma Sintering

Powder metallurgy (P/M) titanium matrix composite (TMC) reinforced with multi-wall carbon nanotube (MWCNT) was prepared by spark plasma sintering (SPS) and hot extrusion process, where the powder surface was coated by un-bundled CNTs via wet process. The microstructure and mechanical properties of P/M pure titanium and reinforced with CNTs were evaluated. The distribution of CNTs and in-situ formed titanium carbide (TiC) compounds during sintering was investigated by optical and scanning electron microscopy (SEM) equipped with EDS analyser. The mechanical properties of TMC were significantly improved by adding a small amount of CNTs. For example, when employing the pure titanium composite powder coated with CNTs of 0.35 mass%, the increase of tensile strength and yield stress of the extruded TMC was 157 MPa and 169 MPa, respectively, compared to those of extruded titanium materials with no CNT additive. Fractured surfaces of specimens were analysed by SEM, and the uniform distribution of CNTs and TiC particles, being effective for the dispersion strengthening, at the surface of the TMC were obviously observed.

Un-Bundled Carbon Nanotubes Reinforced Light Metal Composites via Powder Metallurgy Route

2011 ◽  
Vol 690 ◽  
pp. 339-342
Author(s):  
Katsuyoshi Kondoh ◽  
Thotsaphon Threrujirapapong ◽  
Hiroyuki Fukuda ◽  
Junko Umeda
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Powder Metallurgy ◽  
Pure Titanium ◽  
Hot Extrusion ◽  
Light Metal ◽  
Dispersion Strengthening ◽  
Multi Wall Carbon Nanotubes

By using light metal (Mg, Al, Ti) powders coated with un-bundled multi-wall carbon nanotubes (MWCNTs) via wet process, powder metallurgy (P/M) light metal matrix composite reinforced with un-bundled nanotubes was prepared by spark plasma sintering (SPS) and subsequently hot extrusion process. The microstructure and mechanical properties of the composites were evaluated. In the case of pure titanium, the distribution of CNTs and in-situ formed titanium carbide (TiC) compounds during sintering was investigated by optical and scanning electron microscopy (SEM) equipped with EDS analyzer. The mechanical properties of TMC were significantly improved by the additive of CNTs. For example, when employing the pure titanium composite powder coated with CNTs of 0.35 mass%, the increase of tensile strength and yield stress of the extruded TMC was 157 MPa and 169 MPa, respectively, compared to those of extruded titanium materials with no CNT additive. Fractured surfaces of tensile specimens were analyzed by SEM, and the uniform distribution of CNTs and TiC particles, being effective for the dispersion strengthening, at the surface of the TMC were obviously observed. In the case of Mg-Al alloys, in-situ formation of Al2MgC2compounds at the interface between CNTs and Mg-matrix occurred and effective for the tensile transfer loading, and resulted in the increment of tensile strength of the composite material.

The Preparation and Mechanical Properties of a Pure Titanium-Based Matrix Composite Reinforced with Graphene Nanoplatelets

2020 ◽  
Vol 12 (2) ◽  
pp. 296-303
Author(s):  
Zai-Yu Zhang ◽  
Yi-Long Liang ◽  
Hong-Chuan Cao ◽  
Yong Zhu
Keyword(s):  
Mechanical Properties ◽  
Matrix Composite ◽  
Testing Machine ◽  
Pure Titanium ◽  
Graphene Nanoplatelets ◽  
Matrix Composites ◽  
Dispersion Strengthening ◽  
Titanium Matrix ◽  
Vacuum Sintering ◽  
Materials Used

A lightweight titanium matrix composite material was fabricated by vacuum sintering using semi-powder metallurgy. The graphene nanoplatelets (GNPs) were used as a reinforcement for the titanium matrix composites. Fabricating the composite materials used three steps: dispersion, formation, and sintering. In particular, GNPs were dispersed by ionic liquid through a centrifugal testing machine instead of ball milling in the process. The better pressure for composite forming was 600 MPa. At the same time, the better sintering temperature and holding time were 1200 °C and 3 h. The influences of the GNP addition on the density, microstructure, and microhardness of the Ti/GNP composites were investigated. For the mechanical properties of the composites, we focused on the tensile strength with different GNP contents. The Ti 0.075 wt% and Ti 0.15 wt% GNP composites exhibited yield strengths of 850 and 948 MPa, which demonstrated 66% and 85% increase compared to those of extruded titanium materials with no GNP additive (512 MPa yield strength). The main strengthening mechanisms of Ti/GNP composites are grain refinement strengthening, thermal mismatch strengthening, and dispersion strengthening.

Influence of Carbon Reinforcements on the Mechanical Properties of Ti Composites via Powder Metallurgy and Hot Extrusion

2013 ◽  
Vol 750 ◽  
pp. 40-43 ◽  
Author(s):  
Shu Feng Li ◽  
Bin Sun ◽  
Katsuyoshi Kondoh ◽  
Takanori Mimoto ◽  
Hisashi Imai
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Carbon Nanofiber ◽  
Hot Extrusion ◽  
Strengthening Mechanism ◽  
Matrix Composites ◽  
Solid Solution Strengthening ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Solution Strengthening

Ti metal matrix composites (Ti–MMCs) reinforced by vapor grown carbon nanofiber (VGCF) and graphite particle (Gr) were prepared via powder metallurgy and hot extrusion. Ti with 0~0.4wt% VGCF/Gr mixture powders were consolidated by using spark plasma sintering (SPS) at 800 °C. Hot extrusion was then performed at 1000 °C with an extrusion ratio of 37:1. Microstructures and mechanical properties of the as-extruded Ti composites were investigated. Tensile strength of Ti–VGCF/Gr composites was steadily augmented when additions of VGCF/Gr were increased from 0.1 to 0.4 wt%. YS and UTS were increased 40.2% and 11.4% for Ti–0.4wt%VGCF as compared to pure Ti, while those values were 30.5% and 2.1% for Ti–0.4wt%Gr. The strengthening mechanism including grain refinement, carbon solid solution strengthening and dispersion hardening of TiC/carbon was discussed in detail.

Microstructure and High Temperature Mechanical Properties of Mg-1Si-1Y Alloy

2012 ◽  
Vol 268-270 ◽  
pp. 365-370 ◽  
Author(s):  
Ying Ma ◽  
Zhong Ming Zhang ◽  
Zhen Lin Lv ◽  
Chun Jie Xu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elevated Temperature ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Dispersion Strengthening ◽  
X Ray ◽  
Fine Grained ◽  
High Temperature Mechanical Properties

Mg-1Si alloy doped with 1%Y was prepared by in-situ reaction synthesis. The effect of hot extrusion on the microstructure and elevated-temperature mechanical properties of the alloy was studied. The microstructures were analyzed by optical microscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy and X-ray diffractometry. The results show that as-cast Mg-1Si-1Y alloy consists of dendritic α-Mg phase, eutectic needle-like Mg2Si phase and Mg24+xY5 phase precipitated from α-Mg, Mg2Si can be modified and refined by yttrium, and α-Mg grains can be refined by dynamic recrystallization occurred in hot extrusion process. The tensile strength and elongation of the alloy at ambient temperature are improved prominently by hot extrusion. The tensile strength and elongation of the extruded alloy is 185.3MPa and 24.3% at 120°C. The improved elevated-temperature properties of the alloy are ascribed to the fine-grained strengthening and dispersion strengthening from Mg2Si and Mg24+xY5 particles.

Mechanical Properties of Oxide Dispersion Strengthened Pure Titanium Produced by Powder Metallurgy Method

2010 ◽  
Vol 654-656 ◽  
pp. 815-818 ◽  
Author(s):  
Tomohito Yoshimura ◽  
Thotsaphon Thrirujirapaphong ◽  
Hisashi Imai ◽  
Katsuyoshi Kondoh
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
High Performance ◽  
Pure Titanium ◽  
Full Density ◽  
Powder Metallurgy Method ◽  
Oxide Dispersion ◽  
Dispersion Strengthening ◽  
Tio2 Particles ◽  
Material Cost

Pure titanium has good specific properties i.e. low density of 4.5g/cm3, extremely high resistance for corrosion and good elongation. However, its mechanical properties are not enough to be employed as structural parts and components. Accordingly, titanium alloys are often applied to industrial fields due to their high specific strength. However, the application is limited to high-performance products because of their expensive material cost and poor plastic formability at low temperature. In the present study, from a view point of cost reduction, pure titanium was used as a starting material. The materials design by oxide dispersion strengthening (ODS) was basically applied to improve the poor mechanical strength of pure titanium. TiO2 powders were used as reinforcement dispersoids because of their easily obtainable and low material cost. Powder metallurgy (P/M) method was applied to fabricate TiO2 particles reinforced pure titanium composite. Pure titanium powder and TiO2 particles were elementally mixed by conventional mixing process. Their elemental mixture powders were consolidated by using spark plasma sintering (SPS) equipment to serve a high density compact billet. Subsequently, hot extrusion process was applied to the billet to prepare a full density rod specimen. The evaluation of mechanical properties at room temperature showed high tensile strength of 1040 MPa and good elongation of 25 % when the composite included 1.5mass% TiO2 particles.

scholarly journals The Extrusion and SPS of Zirconium–Copper Powders and Studies of Selected Mechanical Properties

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3560
Author(s):  
Tomasz Skrzekut ◽  
Grzegorz Boczkal ◽  
Adam Zwoliński ◽  
Piotr Noga ◽  
Lucyna Jaworska ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Intermetallic Compounds ◽  
Room Temperature ◽  
Intermetallic Phase ◽  
Extrusion Process ◽  
Strength Properties ◽  
Plasma Sintering ◽  
Copper Powders ◽  
Spark Plasma ◽  
Zirconium Copper

Zr-2.5Cu and Zr-10Cu powder mixtures were consolidated in the extrusion process and using the spark plasma sintering technique. In these studies, material tests were carried out in the fields of phase composition, microstructure, hardness and tensile strength for Zr-Cu materials at room temperature (RT) and 400 °C. Fractography analysis of materials at room temperature and 400 °C was carried out. The research took into account the anisotropy of the materials obtained in the extrusion process. For the nonequilibrium SPS process, ZrCu2 and Cu10Zr7 intermetallic compounds formed in the material at sintering temperature. Extruded materials were composed mainly of α-Zr and ZrCu2. The presence of intermetallic compounds affected the reduction in the strength properties of the tested materials. The highest strength value of 205 MPa was obtained for the extruded Zr-2.5Cu, for which the samples were cut in the direction of extrusion. For materials with 10 wt.% copper, more participation of the intermetallic phase was formed, which lowered the mechanical properties of the obtained materials. In addition to brittle intermetallic phases, the materials were characterized by residual porosity, which also reduced the strength properties.

scholarly journals Characteristics of powder metallurgy pure titanium matrix composite reinforced with multi-wall carbon nanotubes

2009 ◽  
Vol 69 (7-8) ◽  
pp. 1077-1081 ◽  
Author(s):  
Katsuyoshi Kondoh ◽  
Thotsaphon Threrujirapapong ◽  
Hisashi Imai ◽  
Junko Umeda ◽  
Bunshi Fugetsu
Keyword(s):  
Carbon Nanotubes ◽  
Powder Metallurgy ◽  
Matrix Composite ◽  
Pure Titanium ◽  
Titanium Matrix ◽  
Titanium Matrix Composite ◽  
Multi Wall Carbon Nanotubes

scholarly journals Powder Metallurgy Processing and Mechanical Properties of Controlled Ti-24Nb-4Zr-8Sn Heterogeneous Microstructures

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1626
Author(s):  
Benoît Fer ◽  
David Tingaud ◽  
Azziz Hocini ◽  
Yulin Hao ◽  
Eric Leroy ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Ball Milling ◽  
Processing Route ◽  
Fine Grain ◽  
Plasma Sintering ◽  
3D Network ◽  
Spark Plasma ◽  
Powder Particles ◽  
Heterogeneous Microstructures

This paper gives some insights into the fabrication process of a heterogeneous structured β-metastable type Ti-24Nb-4Zr-8Sn alloy, and the associated mechanical properties optimization of this biocompatible and low elastic modulus material. The powder metallurgy processing route includes both low energy mechanical ball milling (BM) of spherical and pre-alloyed powder particles and their densification by Spark Plasma Sintering (SPS). It results in a heterogeneous microstructure which is composed of a homogeneous 3D network of β coarse grain regions called “core” and α/β dual phase ultra-fine grain regions called “shell.” However, it is possible to significantly modify the microstructural features of the alloy—including α phase and shell volume fractions—by playing with the main fabrication parameters. A focus on the role of the ball milling time is first presented and discussed. Then, the mechanical behavior via shear tests performed on selected microstructures is described and discussed in relation to the microstructure and the probable underlying deformation mechanism(s).

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