Influence of PCA Content on Mechanical Properties of Sintered MA Aluminium

2006 ◽  
Vol 514-516 ◽  
pp. 1279-1283 ◽  
Author(s):  
Jesus Cintas ◽  
Juan M. Montes ◽  
Francicso Gomez Cuevas ◽  
José M. Gallardo
Keyword(s):  
Control Agent ◽  
Dispersion Strengthening ◽  
Process Control Agent ◽  
Mechanically Alloyed ◽  
Aluminium Powder ◽  
Attrition Milling ◽  
Ultrafine Grained ◽  
Ultrafine Grained Materials ◽  
Alloyed Aluminium ◽  
Sintering Method

Aluminium powder has been mechanically milled using different amounts of process control agent (PCA). Mechanically alloyed aluminium powder (MA Al) was prepared by attrition milling in the presence of 1.5 and 3wt.% of an EBS wax. Milling was carried out in vacuum during 10 h. Milled powders were consolidated by a press-and-sintering method. This consolidation method is not usually employed with MA Al powders. The amount of dispersed carbides formed in the Al powder increases with the percentage of PCA. These carbides restrain Al grain growth during sintering, resulting in consolidated compacts with a grain size of about 550 nm. Thus, these PM materials can be considered ultrafine grained materials. Due to grain refinement and dispersion strengthening, the tensile strength of MA Al specimens is increased remarkably.

Intermetallic Effects on the Ductility of Sintered Aluminium

2008 ◽  
Vol 587-588 ◽  
pp. 380-384
Author(s):  
Jesus Cintas ◽  
José A. Rodríguez ◽  
Francicso Gomez Cuevas ◽  
José M. Gallardo
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Intermetallic Particle ◽  
Quantitative Metallography ◽  
Mechanically Alloyed ◽  
Aluminium Powder ◽  
Attrition Milling ◽  
Different Temperatures ◽  
Alloyed Aluminium ◽  
Milled Powders

Mechanically alloyed aluminium powder was prepared by attrition-milling for 10 hours in the presence of a wax. Milled powders were annealed in vacuum at different temperatures (500, 575, 600, 625 and 650°C). Compacts were consolidated starting from unannealed and from 600°Cannealed powders. Studies by SEM microfractography and quantitative metallography, to investigate the influence of Fe-Al intermetallics on compacts fracture, have been carried out. It is concluded that fracture takes place at regions where the area occupied by the intermetallics is high and intermetallics particles are big. Intermetallic particle size can be controlled by an appropriated heat treatment.

Mechanical Properties of Nano Grained Ni20Cr20Fe5Nb1Y2O3 Composite and Ni20Cr20Fe5Nb2Al Alloy

2005 ◽  
Vol 297-300 ◽  
pp. 250-256
Author(s):  
Il Ho Kim ◽  
Yong Hwan Kim ◽  
C.S. Kim
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Tensile Strength ◽  
Grain Boundary ◽  
Room Temperature ◽  
Aging Treatment ◽  
Control Agent ◽  
Dispersion Strengthening ◽  
Process Control Agent ◽  
Mechanically Alloyed

The effects of adding Al, Y2O3 and the use of H2O as a PCA (process control agent), on the mechanical properties of mechanically alloyed Ni20Cr20Fe5Nb alloy were studied. The addition of Y2O3 and Al caused an increase in the tensile strength at room temperature, 400°C and 600°C. However, it was confirmed that the increase of tensile strength at room temperature and 400°C was predominantly caused by addition of Y2O3, while that at 600°C was mainly due to addition of Al. These results can be attributed to the dispersion strengthening of Y2O3, preventing the formation of Cr2O3 and the change of fracture mode at 600°C by the addition of Al. Therefore, the Ni20Cr20Fe5Nb2Al alloy using H2O as a PCA showed superior tensile strength at room temperature, 400°C and 600°C. The increase in the tensile strength at room temperature and 400°C can be attributed to the strengthening of the solid solution induced by the increase in the amount of Nb solid solution, resulting from the prevention of NbC formation, while the increase in the tensile strength at 600°C can be attributed to the strengthening of the grain boundary afforded by the presence of Al1.54Cr0.46O3 formed by the addition of Al. After aging treatment for 10 hours at 600°C, g²(Ni3Nb) precipitates were formed in the Ni20Cr20Fe5Nb2Al alloy in which H2O used as the PCA, and the formation of these precipitates caused an increase in hardness.

Nanocrystalline and Ultrafine Grained Materials by Mechanical Alloying

2007 ◽  
Vol 534-536 ◽  
pp. 209-212 ◽  
Author(s):  
Erde Wang ◽  
Lian Xi Hu
Keyword(s):  
Mechanical Alloying ◽  
Nanocrystalline Powder ◽  
Powder Materials ◽  
Hydrogen Storage Material ◽  
Mechanically Alloyed ◽  
Al Composite ◽  
Ultrafine Grained ◽  
Ultrafine Grained Materials ◽  
Institute Of Technology ◽  
Synthesized Materials

Recent research at Harbin Institute of Technology on the synthesis of nanocrystalline and untrafine grained materials by mechanical alloying is reviewed. Examples of the materials include aluminum alloy, copper alloy, Ti/Al composite, magnesium-based hydrogen storage material, and Nd2Fe14B/α-Fe magnetic nanocomposite. Details of the processes of mechanical alloying and consolidation of the mechanically alloyed nanocrystalline powder materials are presented. The microstructure characteristics and properties of the synthesized materials are addressed.

Influence of Process Control Agent and Al Concentration on Synthesis and Phase Stability of a Mechanically Alloyed AlxCoCrFeMnNi High-Entropy Alloy

2021 ◽  
pp. 160770
Author(s):  
M.A. Ruiz-Esparza-Rodriguez ◽  
C.G. Garay-Reyes ◽  
I. Estrada-Guel ◽  
J.L. Hernández-Rivera ◽  
J.J. Cruz-Rivera ◽  
...  
Keyword(s):  
Process Control ◽  
Phase Stability ◽  
Control Agent ◽  
High Entropy Alloy ◽  
Process Control Agent ◽  
Mechanically Alloyed ◽  
High Entropy

scholarly journals Effects of Process Control Agent Amount, Milling Time, and Annealing Heat Treatment on the Microstructure of AlCrCuFeNi High-Entropy Alloy Synthesized through Mechanical Alloying

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1493
Author(s):  
Negar Yazdani ◽  
Mohammad Toroghinejad ◽  
Ali Shabani ◽  
Pasquale Cavaliere
Keyword(s):  
Solid Solution ◽  
Process Control ◽  
Mechanical Alloying ◽  
Milling Time ◽  
Control Agent ◽  
High Entropy Alloy ◽  
Process Control Agent ◽  
Mechanically Alloyed ◽  
X Ray ◽  
High Entropy

This study was conducted to investigate the characteristics of the AlCrCuFeNi high-entropy alloy (HEA) synthesized through mechanical alloying (MA). In addition, effects of Process Control Agent (PCA) amount and milling time were investigated using X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). The results indicated that the synthesized AlCrCuFeNi alloy is a dual phase (FCC + BCC) HEA and the formation of the phases is strongly affected by the PCA amount. A high amount of PCA postponed the alloying process and prevented solid solution formation. Furthermore, with an increase in the PCA amount, lattice strain decreased, crystallite size increased, and the morphology of the mechanically alloyed particles changed from spherical to a plate-like shape. Additionally, investigation of thermal properties and annealing behavior at different temperatures revealed no phase transformation up to 400 °C; however, the amount of the phases changed. By increasing the temperature to 600 °C, a sigma phase (σ) and a B2-ordered solid solution formed; moreover, at 800 °C, the FCC phase decomposed into two different FCC phases.

scholarly journals The Effect of Process Control Agent on the Oxidation of Nanocrystalline Mechanically Alloyed AlCoCrFeMnNi Powders

2018 ◽  
Vol 24 (S1) ◽  
pp. 2268-2269
Author(s):  
M.A. Ruiz-Esparza-Rodriguez ◽  
C.G. Garay-Reyes ◽  
I. Estrada-Guel ◽  
J.M. Mendoza-Duarte ◽  
M.C. Maldonado-Orozco ◽  
...  
Keyword(s):  
Process Control ◽  
Control Agent ◽  
Process Control Agent ◽  
Mechanically Alloyed

Process control agent effect on the structural and magnetic properties of mechanically alloyed Fe(Al) disordered system

2021 ◽  
pp. 168246
Author(s):  
Marvin Montoya Rangel ◽  
Juan Marcos Marín Ramírez ◽  
Liliana Tirado Mejía ◽  
Milton Humberto Medina Barreto ◽  
Beatriz Cruz Muñoz
Keyword(s):  
Magnetic Properties ◽  
Process Control ◽  
Control Agent ◽  
Process Control Agent ◽  
Mechanically Alloyed ◽  
Disordered System ◽  
Structural And Magnetic Properties

Superplastic Behavior in Ultrafine-Grained Materials Produced by Equal-Channel Angular Pressing

2008 ◽  
Vol 579 ◽  
pp. 29-40 ◽  
Author(s):  
Cheng Xu ◽  
Megumi Kawasaki ◽  
Roberto B. Figueiredo ◽  
Zhi Chao Duan ◽  
Terence G. Langdon
Keyword(s):  
Equal Channel Angular Pressing ◽  
High Strain ◽  
Processing Method ◽  
Strain Rates ◽  
Bulk Materials ◽  
Superplastic Behavior ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Ultrafine Grained Materials ◽  
Aluminum And Magnesium Alloys

Equal-channel angular pressing (ECAP) is a convenient processing method for refining the grain size of bulk materials to the submicrometer level. Metallic alloys processed by ECAP often exhibit excellent superplastic characteristics including superplasticity at high strain rates. This paper summarizes recent experiments designed to evaluate the occurrence of superplasticity in representative aluminum and magnesium alloys and in the Zn-22% Al eutectoid alloy.

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