Solidification Structures in Low-Alloyed Powder Metallurgy Steels Obtained through Permanent Liquid Phase Sintering Using a Master Alloy Containing Boron

2020 ◽  
Vol 9 (4) ◽  
pp. 20190205
Author(s):  
Simon Gélinas ◽  
Jean-Nicolas Rousseau ◽  
Carl Blais
Keyword(s):  
Powder Metallurgy ◽  
Liquid Phase ◽  
Master Alloy ◽  
Liquid Phase Sintering ◽  
Alloyed Powder

Mechanical properties of Al-Cu/B4C and Al-Mg/B4C metal matrix composites

2021 ◽  
Vol 63 (4) ◽  
pp. 350-355
Author(s):  
Mehmet Ayvaz ◽  
Hakan Cetinel
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Liquid Phase ◽  
Oxide Layer ◽  
Solid Phase ◽  
Aluminum Matrix ◽  
Liquid Phase Sintering ◽  
Aluminum Matrix Composites ◽  
Powder Metallurgy Method ◽  
Matrix Composites

Abstract To be able to successfully produce ceramic-reinforced aluminum matrix composites by using the powder metallurgy method, the wetting of ceramic reinforcements should be increased. In addition, the negative effects of the oxide layer of the aluminum matrix on sinterability should be minimized. In order to break the oxide layer, the deoxidation property of Mg can be used. Furthermore, by creating a liquid phase, both wettability and sinterability can be improved. In this study, the effects of Mg and Cu alloy elements and sintering phase on the wettability, sinterability, and mechanical properties of Al/B4C composites were investigated. For this purpose, various amounts (5, 10, 20, and 30 wt.-%) of B4C reinforced Al5Cu and Al5Mg matrix composites were produced by the powder metallurgy method. After pressing under 400 MPa pressure, composite samples were sintered for 4 hours. The sintering was carried out in two different groups as solid phase sintering at 560 °C and liquid phase sintering at 610 °C. Despite the deoxidation effect of Mg in Al5Mg matrix composites, higher mechanical properties were determined in Al5Cu composites which were sintered in liquid phase because wettability increased. The highest mechanical properties were obtained in the 20 wt.-% B4C reinforced Al5Cu sample sintered in liquid phase.

Liquid Phase Sintering of Leaded Tin Bronze Alloyed Powder

2015 ◽  
Vol 69 (7) ◽  
pp. 1377-1388 ◽  
Author(s):  
Abbas Sabahi Namini ◽  
Maziyar Azadbeh ◽  
Ahad Mohammadzadeh ◽  
Sheida Shadpour
Keyword(s):  
Liquid Phase ◽  
Liquid Phase Sintering ◽  
Alloyed Powder ◽  
Tin Bronze

The Use of Transient Liquid Phases in Powder Metallurgy

2021 ◽  
Vol 1016 ◽  
pp. 69-76
Author(s):  
Herbert Danninger ◽  
Raquel de Oro Calderon ◽  
Christian Gierl-Mayer
Keyword(s):  
Powder Metallurgy ◽  
Liquid Phase ◽  
Transient Liquid Phase ◽  
Liquid Phase Sintering ◽  
Porous Powder ◽  
Material Transport ◽  
Liquid Phases ◽  
Short Period ◽  
Constant Quantity ◽  
Transient Liquid Phases

Liquid phase sintering is most widely known in its variant „persistent liquid phase sintering“, in which case the liquid phase is present in constant quantity during the entire isothermal period. There is however also the variant „transient liquid phase“, the melt being present only for a short period in the first stage of sintering and then solidifying through diffusional processes. In this presentation, the preconditions for both variants are presented, in particular with regard to the starting materials. The benefits of transient liquid phases are described, both for sintering – to accelerate material transport, contact formation and microstructural homogenization compared to standard solid state sintering – and for transient liquid phase bonding, a brazing variant which is an attractive method for joining porous powder compacts. Both techniques are highly useful in particular for ferrous powder metallurgy precision components, etc.

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