Fabrication of Al-Based Matrix Composite Reinforced with WAl12 Intermetallic Particles by Press-Forming Process Using High-Energy Ball-Milled Powders

2012 ◽  
Vol 476-478 ◽  
pp. 574-578
Author(s):  
Shu Guang Cai
Keyword(s):  
Composite Material ◽  
Matrix Composite ◽  
High Energy ◽  
Forming Process ◽  
Forming Technology ◽  
Press Forming ◽  
Intermetallic Particles ◽  
Energy Ball ◽  
Al Matrix ◽  
Milled Powders

The 22wt%WAl12intermetallic particulate reinforced Al-based matrix composite was successfully fabricated by press-forming technology using high-energy ball-milled powders. X-ray diffraction analysis shows that WAl12reinforcement phase has been obtained after in situ reaction of Al matrix with W14Al86alloy at 620°C. The mechanical properties of the composite material were studied at room temperature. The Young’s modulus, microhardness and the maximum ultimate tensile strength of this composite material can reach 75GPa, 1.51GPa and 471MPa, respectively. The results show that there is a good interfacial bonding between the Al matrix and WAl12particles. However, the composite cannot be applied in high temperature environment because of its fairly low strength residual ratio.

Microstructure and thermoelectric properties of Ga-DOPED SiGe alloys prepared by mechanical alloying and induction hot pressing

2014 ◽  
Vol 07 (02) ◽  
pp. 1450008 ◽  
Author(s):  
Shanshan Lin ◽  
Chunlin Wang ◽  
Haiyan Chen ◽  
Dexuan Huo ◽  
Nick Savvides ◽  
...  
Keyword(s):  
Ball Milling ◽  
Hot Pressing ◽  
High Energy ◽  
Solid Solution Phase ◽  
Nominal Composition ◽  
Mill Time ◽  
Composition Property ◽  
Energy Ball ◽  
P Type ◽  
Milled Powders

Ga -doped SiGe alloys were prepared by high energy ball milling followed by induction hot pressing. The grain size decreases dramatically with increasing mill time, and nanostructured features in the range 3–500 nm were introduced after extensive ball milling for 2–12 h. The bulk alloys hot pressed from 2 h and 6 h dry-milled powders consist of different compositions of micron- to nanosized Si y Ge 100-y, where Ga prefers to locate in the submicron- and nanosized Ge -rich phase and form a modulation-doping structure. The samples hot pressed from 12 h wet-milled powders are more homogeneous in microstructure and composition. Property characterization shows that although Ga -doping leads to p-type conduction, only part of Ga atoms is incorporated as dopant in the SiGe solid solution phase. Samples hot pressed from 2 h and 6 h dry-milled powders have higher power factors, while those hot pressed from 12 h wet-milled powders posses much lower thermal conductivity. The maximum figure of merit (ZT) is 0.51 at 805°C for the 6 h dry-milled and hot pressed sample with the nominal composition Si 80 Ge 18 Ga 2.

A Study on Characteristics of TiH2-Al-Nb Alloyed Powder During High Energy Ball Milling

2011 ◽  
Vol 688 ◽  
pp. 1-5
Author(s):  
Hua Chen ◽  
Tian Yu Zhang ◽  
X.Y Lu ◽  
Su Qiu Jia ◽  
Zhi Long Chai
Keyword(s):  
Ball Milling ◽  
Metastable Phase ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Morphology Evolution ◽  
System Alloy ◽  
Forming Process ◽  
Mixed Powder ◽  
Tial Intermetallics ◽  
Energy Ball

In this paper, TiH2-47Al-5Nb (at.%) and TiH2-47Al-7Nb(at.%) alloys were mixed and synthesized using TiH2, Al and Nb powders. The composition and morphology evolution of the mixed powder were systematically investigated during high energy ball milling. The results show obvious that structure change of the particle during milling, and amorphous, TiAl, Ti3Al and Ti2Al phases at nanoscale are formed. The addition of Nb shows an active influence on the decomposition of TiH2and formation of TiAl-intermetallics. Compare with Ti-Al system alloy, the forming process of TiAl-intermetallics for TiH2-Al-Nb system alloy is different and slower. Ti2Al metastable phase formed after ball milling for 15 h in our experiments.

scholarly journals Influence of Milling Media on the Mechanical Alloyed W-0.5 wt.% Ti Powder Alloy

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Hadi Jahangiri ◽  
Sultan Sönmez ◽  
M. Lütfi Öveçoğlu
Keyword(s):  
Crystallite Size ◽  
Milling Time ◽  
High Energy ◽  
Lattice Parameter ◽  
Mechanically Alloyed ◽  
High Energy Ball Mill ◽  
Powder Density ◽  
Energy Ball ◽  
Ti Powder ◽  
Milled Powders

The effects of milling atmosphere and mechanical alloying (MA) duration on the effective lattice parameter, crystallite size, lattice strain, and amorphization rate of the W-0.5 wt.% Ti powders were investigated. W-0.5 wt.% Ti powders were mechanically alloyed (MA’d) for 10 h and 20 h in a high energy ball mill. Moreover, morphology of the powders for various MA was analyzed using SEM microscopy. Their powder density was also measured by helium pycnometer. The dry milled agglomerated powders have spherical particle, while wet milled powders have layered morphology. Milling media and increasing of milling time significantly reduce the crystallite size. The smallest crystallite size is 4.93 nm which belonged to the dry milled powders measured by Lorentzian method after 20 hours’ MA. However, after 20 hours, MA’d powders show the biggest crystallite size, as big as 57.07 nm, measured with the same method in ethanol.

ROLE OF PROCESS CONTROL AGENT ON MECHANICAL ALLOYING OF NANO STRUCTURED TiAl-BASED ALLOY

2008 ◽  
Vol 22 (18n19) ◽  
pp. 2933-2938 ◽  
Author(s):  
H. BAHMANPOUR ◽  
S. HESHMATI-MANESH
Keyword(s):  
Process Control ◽  
Stearic Acid ◽  
Milled Powder ◽  
High Energy ◽  
Control Agent ◽  
X Ray Diffraction ◽  
Process Control Agent ◽  
Crystallite Sizes ◽  
Energy Ball ◽  
Milled Powders

High energy ball milling was performed on a mixture of titanium and aluminum elemental powders with a composition of Ti -48(at.%) Al . Stearic acid was added to this powder mixture as a process control agent (PCA) to study its effect on the microstructure evolution and crystallite size of the milled powder after various milling times. Phase compositions and morphology of the milled powders were evaluated using X-ray diffraction and scanning electron microscopy. Crystallite sizes of milled powders were determined by Cauchy-Gaussian approach using XRD profiles. It was shown that addition of 1wt.% of stearic acid not only minimizes the adhesion of milling product to the vial and balls, but also reduces its crystallite sizes. It has also a marked effect on the morphology of the final product.

The Roll-Forming Process Analysis of the Situation and Development Trend

2018 ◽  
Vol 764 ◽  
pp. 201-209
Author(s):  
Miao Hu ◽  
Yan Bo Li ◽  
Xin Li ◽  
Xiao Lin Cao ◽  
Min Hou
Keyword(s):  
Product Design ◽  
Process Analysis ◽  
Rapid Development ◽  
High Energy ◽  
Roll Forming ◽  
Original Research ◽  
Forming Process ◽  
Design Quality ◽  
Forming Technology ◽  
Roll Forming Process

Roll – forming is through the allocation of roll the sheets for multiple successive of transverse bending deformation process of the section, to form a specific shape with high energy efficiency, uniform cross section, stable product quality, etc. Since the 19th century began to study the roll-forming process, successively completed the exploration of this kind of technology and promotion from 1938 to 1938.It has entered the rapid development of roll-forming technology at present. Began to roll-forming technology research relatively late in our country, but the trend of development of fast, such as the construction industry, automotive industry, white home appliance industry has been widely used, to specific parts such as highway anti-collision WeiDang, auto parts anticollision beam beams, before and after the threshold of the anticollision beam and a side door production, etc. Roll-forming technology belongs to the nonlinear problem of large plastic deformation, the forming theory of the present domestic scholars have researched, forming a simplified analytical method, energy analysis method, cable original research method and finite element method theory. With the development of computer aided design technology, through the computer simulation of sheet deformation and regional stress analysis, and makes the product design cycle is shortened, the product design quality was improved. At home and abroad, roll-forming equipment have developed highly efficient, the formation of the uncoiled stamping - roll-forming - welding - material such as plastic - cut – code craft route, eventually forming the results approach to the product shape, implementation process highly integrated production mode, cold-formed molding equipment of high automation intelligent design, help to realize planning of ‘Made in China 2025 strategy’ in the industry of roll-forming.

Microstructural and mechanical study of an Al matrix composite reinforced by Al-Cu-Fe icosahedral particles

2010 ◽  
Vol 25 (5) ◽  
pp. 957-965 ◽  
Author(s):  
Guillaume Laplanche ◽  
Anne Joulain ◽  
Joël Bonneville ◽  
Veronique Gauthier-Brunet ◽  
Sylvain Dubois ◽  
...  
Keyword(s):  
Composite Material ◽  
Matrix Composite ◽  
Load Transfer ◽  
Constant Strain Rate ◽  
Icosahedral Phase ◽  
Strengthening Effect ◽  
Compression Tests ◽  
Mechanical Study ◽  
Al Matrix Composite ◽  
Al Matrix

In this study, we produced an Al matrix composite material reinforced by Al-Cu-Fe particles of the icosahedral phase. The composite material was prepared using a hot isostatic pressure technique at T = 673 K and P = 180 MPa. The mechanical properties were investigated by compression tests performed at constant strain rate over the temperature range 290–823 K. The results show a vigorous strengthening effect resulting from the reinforcement particles. Strengthening is attributed to two main contributions arising from load transfer between the Al matrix and the reinforcement particles and from plastic deformation of the Al grains. The present results are compared with those obtained in a previous work on an Al-based composite reinforced by Al-Cu-Fe particles of the ω-tetragonal phase.

Densification of Mechanically Alloyed Al5083-5wt% Y2O3 Nano Composite by Equal Channel Angular Pressing

2014 ◽  
Vol 592-594 ◽  
pp. 963-967
Author(s):  
Pravir Polly ◽  
K. Chandra Sekhar ◽  
Balasubramanian Ravisankar ◽  
S. Kumaran
Keyword(s):  
Equal Channel Angular Pressing ◽  
Single Phase ◽  
Milled Powder ◽  
High Energy ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Nano Composite ◽  
Angular Pressing ◽  
Energy Ball ◽  
Milled Powders

In the present work, Al-5083-5wt% nanoyttria powders were milled for 10, 20, 30 and 35 hrs in a high energy ball milling under optimised process parameters. The milled powders were characterised by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Milled powders exhibit nanocrystalline single phase after 10hrs of milling. Consolidation of 35 hrs milled powder was done by equal channel angular pressing (ECAP) through 90odie channel angle using route A upto three passes with and without back pressure and sintered under controlled environment. Density of ECAPed samples was measured using Archimedes principle. The density is 96% for the sample consolidated with backpressure after two passes after sintering.

Sign in / Sign up

Export Citation Format

Share Document