scholarly journals Sintering Behaviour of Al-Cu-Mg-Si Blends

2007 ◽  
Vol 534-536 ◽  
pp. 597-600 ◽  
Author(s):  
C. Lucien Falticeanu ◽  
I.T.H. Chang ◽  
J.S. Kim ◽  
R. Cook
Keyword(s):  
Alloy Powder ◽  
Effect Of Temperature ◽  
Microstructural Development ◽  
Al Alloy ◽  
Sintering Process ◽  
Scanning Calorimetry ◽  
Increasing Demand ◽  
Sintering Behaviour ◽  
Evolution Of Microstructure ◽  
Initial Starting

The increasing demand for automotive industries to reduce the weight of the vehicles has led to a growing usage of Al alloy powder metallurgy (P/M) parts such as camshaft bearing caps, shock absorber pistons and brake calipers [1,2]. In order to control the sintered microstructure and mechanical properties of the aluminium alloy powder metallurgical (P/M) parts, it is essential to establish a fundamental understanding of the microstructural development during the sintering process. Current research at Birmingham University is focussed on the investigation of the sintering behaviour of Al-Cu-Mg-Si powder blends using a combination of Scanning Electron Microscopy, Energy Dispersive Microanaylsis (SEM) and Differential Scanning Calorimetry (DSC). This paper presents a detailed study of the effect of temperature and initial starting materials on the evolution of microstructure during the sintering of Al-Cu-Mg-Si blends for PM.

scholarly journals Study on Sintering of Artificially Oxidized Steel Compacts

2019 ◽  
Vol 19 (1) ◽  
pp. 12-22
Author(s):  
C. Gierl-Mayer ◽  
T. Stepan ◽  
J. Sun ◽  
H. Danninger
Keyword(s):  
Thermal Analysis ◽  
Iron Oxides ◽  
Steel Powder ◽  
Microstructural Development ◽  
Sintering Process ◽  
Low Oxygen ◽  
Iron And Steel ◽  
Reducing Conditions ◽  
Different Temperatures ◽  
Sintering Behaviour

AbstractSintering of Cr-prealloyed PM steels requires atmospheres with good quality – low oxygen potential – to achieve satisfactory sintering results. But during heating even the best atmospheres may be oxidizing, the system turns to reducing conditions only at high temperatures, which can be monitored by thermal analysis. During the dewaxing process, oxidizing conditions are favourable for effective dewaxing without sooting and blistering. However, this may result in some oxygen pickup during heating, and then the final properties of the produced parts may be strongly influenced by this intermediate oxidation. This study demonstrates the behaviour of artificially oxidized steels (Fe-C and Fe3Cr-0.5Mo-C) during the sintering process by stepwise sintering. Iron and steel powder were slightly oxidized and then pressed and sintered at different temperatures. In parallel, as a second approach, pressed samples were oxidized and then sintered. Density, hardness and impact energy were measured and dilatometry/MS was used for online monitoring of the sintering process. The starting oxygen content of 0.20 to 0.30 wt% is high enough to change the sintering behaviour of the materials, but still leads to rather good properties. Thermal analysis showed that most of the oxygen picked up was present as iron oxides on the surface which were reduced by hydrogen at rather low temperatures, confirming that these were iron oxides, which also holds for the Cr-prealloyed variant. The biggest influence on the final performance was exerted by the final carbon content and the microstructural development of the material.

Microstructure and Properties of Zn61Al34M5 Alloy Produced by Rapid Solidification and Warm-Compacting Sintering Process

2007 ◽  
Vol 534-536 ◽  
pp. 829-832
Author(s):  
Hai Yi Lou ◽  
Wei Lu ◽  
Lei Yang ◽  
Biao Yan
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Al Alloys ◽  
Al Alloy ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Α Phase ◽  
Scanning Electron

Microstructure and mechanical properties of a newly developed Zn61Al34M5 (M=Cu, Si, RE, et al.) alloy obtained by warm-compacting sintering technique were studied using optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and differential scanning calorimetry (DSC) associated with measurements of mechanical properties. The results showed that the new alloy consisted of α-phase and η-phase and have good plasticity; its hardness increased by 10%~20% and density decreased by about 16% as compared with those of the traditional cast Zn-Al alloys.

Enhanced Sintering of Pre-Alloyed Binary TiAl Powder by a Small Addition of Iron

2012 ◽  
Vol 520 ◽  
pp. 89-94 ◽  
Author(s):  
Y. Xia ◽  
Graham B. Schaffer ◽  
Ma Qian
Keyword(s):  
Alloy Powder ◽  
Tial Alloy ◽  
Xrd Analysis ◽  
Small Addition ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Sintering Aid ◽  
Fe Content ◽  
Sintering Behaviour ◽  
Eds Microanalysis

TiAl alloy powder is difficult to sinter unless assisted with pressure and/or pulsed current. This paper investigates the effect of a small addition of iron on the sintering behaviour of γ-TiAl alloy powder at 1350 °C in vacuum. Thermodynamic calculations using Thermo-Calc and the Ti-alloy database TTTI3 predict that iron is a potential sintering aid for TiAl powder. The relative sintered density (RSD) increased with increasing Fe content and peaked at an addition of 2at.%Fe, at which the RSD increased from ~ 60% theoretical density (TD) without iron to ~ 97%TD. The enhanced densification is attributed to liquid formation induced by iron based on both thermodynamic predictions and differential scanning calorimetry (DSC) analysis. The as-sintered microstructures and phase constituents were analysed by scanning electron microscopy (SEM) equipped with an energy dispersive spectroscopy (EDS) microanalysis system and X-ray diffraction (XRD) analysis.

Nitride Dispersion Strengthened Steel Development after Sintering of Nitrided Fe‐4.6 at.% Al Alloy Powder

2021 ◽  
Author(s):  
Akeshwar Singh Yadav ◽  
Philipp Kürnsteiner ◽  
Eric A. Jägle ◽  
K.N. Sasidhar ◽  
Sai Ramudu Meka
Keyword(s):  
Alloy Powder ◽  
Al Alloy

Mechanochemical synthesis of a Mg-Li-Al-H complex hydride

2009 ◽  
Vol 24 (9) ◽  
pp. 2880-2885 ◽  
Author(s):  
Jing Zhang ◽  
Wei Yan ◽  
Chenguang Bai ◽  
Fusheng Pan
Keyword(s):  
Solid Solution ◽  
Hydrogen Storage ◽  
Storage Capacity ◽  
Raw Materials ◽  
Initial Step ◽  
Hydrogen Atmosphere ◽  
Al Alloy ◽  
Hydrogen Storage Capacity ◽  
Scanning Calorimetry ◽  
Complex Hydride

Mg-Li-Al alloy was prepared by ingot casting and then underwent subsequent reactive ball milling. A Mg-Li-Al-H complex hydride was obtained under a 0.4 MPa hydrogen atmosphere at room temperature, and as high as 10.7 wt% hydrogen storage capacity was achieved, with the peak desorption temperature of the initial step at approximately 65 °C. The evolution of the reaction during milling, as well as the effect of Li/Al ratio in the raw materials on the desorption properties of the hydrides formed, were studied by x-ray diffraction and simultaneous thermogravimetry and differential scanning calorimetry techniques. The results showed that mechanical milling increases the solubility of Li in Mg, leading to the transformation of bcc β(Li) solid solution to hcp α(Mg) solid solution, the latter continues to incorporate Li and Al, which stimulates the formation of Mg-Li-Al-H hydride. A lower Li/Al ratio resulted in faster hydrogen desorption rate and a greater amount of hydrogen released at a low temperature range, but sacrificing total hydrogen storage capacity.

Effects of Steam Heat and Dry Heat Sterilization on Thermal and Mechanical Properties of Nylon and Policarbonate in Fabrication with Fused Filament

2021 ◽  
Vol 891 ◽  
pp. 150-163
Author(s):  
Jorge Mauricio Fuentes ◽  
Omar Flor Unda ◽  
Santiago Ferrandiz ◽  
Franyelit Suarez
Keyword(s):  
Mechanical Properties ◽  
Thermomechanical Analysis ◽  
Mechanical Tests ◽  
Effect Of Temperature ◽  
Mechanical And Thermal Properties ◽  
Scanning Calorimetry ◽  
Thermal Tests ◽  
Dry Heat ◽  
Izod Impact ◽  
Steam Heat

In this article presents evidence about performance of mechanical properties of polycarbonate and nylon materials, which are used in the additive manufacturing by deposition of molten material and that have been subjected to sterilization processes by moist heat at 121°C and dry heat at 140°C. This study provides useful information to consider the use of these materials in sanitary and sterile settings. Mechanical tests of tensile, flex, hardness, Izod impact, thermal tests in Differential Scanning Calorimetry DSC, Thermomechanical analysis TMA and Scanning Electron Microscopy SEM were performed. It is concluded that the mechanical and thermal properties have not been altered through the effect of temperature in sterilization processes.

Evolution of Sintering of Particles that Compose Iron Ore Agglomerates

2017 ◽  
Vol 899 ◽  
pp. 371-376
Author(s):  
Flavia de Paula Vitoretti ◽  
Maria Carolina dos Santos Freitas ◽  
Camila Martins Hosken ◽  
Jose Adilson de Castro ◽  
Fabiane Roberta Freitas da Silva
Keyword(s):  
Iron Ore ◽  
Room Temperature ◽  
New Technologies ◽  
Microstructural Characterization ◽  
Sintering Process ◽  
Iron Ore Pellets ◽  
Ore Pellets ◽  
Reduction Of Iron ◽  
Increasing Demand ◽  
Metallurgical Characterization

The increasing demand for new technologies in the ironmaking/steelmaking field has been motivating several studies towards pelletizing process improvement. Within this context, evaluate the reduction of iron ore pellets using the dilatometer technique constitutes a promising approach for optimizing this process. This paper aims the metallurgical characterization through the sintering of particles in iron ore pellets. With this purpose, some experimental procedures are of concern as follows. Firstly, the kinetic densification of the iron ore pellets is measured using a dilatometer, which heats the samples up at 30 K/min until high temperatures about 1473 K and an isotherm at 10 minutes have been done. Then, the sample is cooled back to room temperature and undergoes a microstructural characterization, with the aid of a scanning electron microscope. At last, the density of the pellets is evaluated, using an Arquimedes Principle and consequently the porosity of the agglomerates. The results indicate the sintering progress of the particles that comprise the pellets as well as reduction the porosity. This behavior is due to the fact that the heat arising from gas induces the partial liquid phase formation and involves the agglomerate particles aiding in the sintering process.

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