Processing of a Ternary Al-Sc-Zr Powder Metallurgy Alloy via Spark Plasma Sintering and Hot Asymmetric Rolling

2019 ◽  
pp. 219-237
Author(s):  
M. Y. Amegadzie ◽  
I. W. Donaldson ◽  
D. P. Bishop
Keyword(s):  
Powder Metallurgy ◽  
Spark Plasma Sintering ◽  
Asymmetric Rolling ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Powder Metallurgy Alloy

Effect of Spark Plasma Sintering on the Microstructure Evolution and Properties of M3:2 High-Speed Steel

2014 ◽  
Vol 788 ◽  
pp. 329-333
Author(s):  
Rui Zhou ◽  
Xiao Gang Diao ◽  
Jun Chen ◽  
Xiao Nan Du ◽  
Guo Ding Yuan ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Spark Plasma Sintering ◽  
High Speed ◽  
Bending Strength ◽  
Sintering Temperature ◽  
High Speed Steel ◽  
Continuous Heating ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
The Impact

Effects of sintering temperatures on the microstructure and mechanical performance of SPS M3:2 high speed steel prepared by spark plasma sintering was studied. High speed steel sintering curve of continuous heating from ambient temperature to 1200°C was estimated to analyze the sintering processes and sintering temperature range. The sintering temperature within this range was divided into groups to investigate hardness, relative density and microstructure of M3:2 high-speed steel. Strip and quadrate carbides were observed inside the equiaxed grains. SPS sintering temperature at 900°C can lead to nearly full densification with grain size smaller than 20μm. The hardness and bending strength are higher than that of the conventionally powder metallurgy fabricated ones sintered at 1270°C. However, fracture toughness of the high speed steel is lower than that of the conventional powder metallurgy steels. This can be attributed to the shape and distribution of M6C carbides which reduce the impact toughness of high speed steels.

Biomedical Ti-24Nb-4Zr-7.9Sn Alloy Fabricated by Conventional Powder Metallurgy and Spark Plasma Sintering

2012 ◽  
Vol 520 ◽  
pp. 208-213 ◽  
Author(s):  
Shi Bo Guo ◽  
Chun Bo Cai ◽  
Yong Qiang Zhang ◽  
Yong Xiao ◽  
Xuan Hui Qu
Keyword(s):  
Tensile Strength ◽  
Powder Metallurgy ◽  
Relative Density ◽  
Spark Plasma Sintering ◽  
Raw Materials ◽  
Fracture Morphology ◽  
Sintering Process ◽  
Comprehensive Properties ◽  
Plasma Sintering ◽  
Spark Plasma

Ti-24Nb-4Zr-7.9Sn alloy was prepared by Powder Metallurgy (PM) and Spark Plasma Sintering (SPS) using titanium hydride powder, niobium powder, zirconium powder and tin powder as raw materials. The effect of sintering process on microstructure and mechanical properties was investigated by mechanical measurement and SEM. The results showed that the best sintering process by PM was at 12500C for 2 h. The relative density, tensile strength and elongation of the alloy reached 97.2%, 705MPa and 6.2%, respectively. The microstructure was a typical Widmannstatten microstructure, which possessed β-matrix and α-precipitation. The best process by SPS was at 12500C. The relative density, tensile strength and elongation of the alloy sintered by SPS reached 99.4%, 788.5MPa and 6.4%, respectively. The grain size was about 100µm and the microstructure was uniform. The fracture morphology of the alloy was ductile rupture. Compared to PM, Ti-24Nb-4Zr-7.9Sn alloy fabricated by SPS exhibited better comprehensive properties and more uniform microstructure.

scholarly journals Advanced Powder Metallurgy Technologies

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1742 ◽  
Author(s):  
Pavel Novák
Keyword(s):  
World War Ii ◽  
Powder Metallurgy ◽  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
Chemical Reduction ◽  
Hot Isostatic Pressing ◽  
Synthesis Methods ◽  
Special Focus ◽  
Plasma Sintering ◽  
Spark Plasma

Powder metallurgy is a group of advanced processes for the synthesis, processing, and shaping of various kinds of materials. Initially inspired by ceramics processing, the methodology comprising of the production of a powder and its transformation to a compact solid product has attracted great attention since the end of World War II. At present, there are many technologies for powder production (e.g., gas atomization of the melt, chemical reduction, milling, and mechanical alloying) and its consolidation (e.g., pressing and sintering, hot isostatic pressing, and spark plasma sintering). The most promising ones can achieve an ultra-fine or nano-grained structure of the powder, and preserve it during consolidation. Among these methods, mechanical alloying and spark plasma sintering play a key role. This Special Issue gives special focus to the advancement of mechanical alloying, spark plasma sintering and self-propagating high-temperature synthesis methods, as well as to the role of these processes in the development of new materials.

Ultrafine-grained Ti66Nb13Cu8Ni6.8Al6.2 composites fabricated by spark plasma sintering and crystallization of amorphous phase

2009 ◽  
Vol 24 (6) ◽  
pp. 2118-2122 ◽  
Author(s):  
Y.Y. Li ◽  
C. Yang ◽  
W.P. Chen ◽  
X.Q. Li ◽  
S.G. Qu
Keyword(s):  
Mechanical Properties ◽  
Powder Metallurgy ◽  
Spark Plasma Sintering ◽  
Amorphous Phase ◽  
Fracture Strength ◽  
High Fracture ◽  
Plasma Sintering ◽  
Ultrafine Grained ◽  
Spark Plasma

We report on the formation of ultrafine-grained Ti66Nb13Cu8Ni6.8Al6.2 composites with in situ precipitated micrometer-sized β-Ti(Nb) phase by spark plasma sintering with crystallization. Microstructure analysis indicated that all alloys consisted of soft (Cu, Ni)Ti2 regions surrounded by hard β-Ti(Nb) regions but displayed different microstructures. The alloys exhibited high fracture strength of more than 2200 MPa and remarkable plasticity of ∼25%. The results provided a promising method for fabricating large-sized bulk composites with excellent mechanical properties by powder metallurgy.

scholarly journals Microstructural Properties of Nb-Si Based Alloys Manufactured by Powder Metallurgy

2011 ◽  
Vol 278 ◽  
pp. 533-538 ◽  
Author(s):  
Stefan Drawin ◽  
J.P. Monchoux ◽  
J.L. Raviart ◽  
Alain Couret
Keyword(s):  
Heat Treatment ◽  
Powder Metallurgy ◽  
Spark Plasma Sintering ◽  
Hot Extrusion ◽  
Conventional Technique ◽  
Subsequent Heat Treatment ◽  
Microstructural Properties ◽  
Niobium Silicide ◽  
Plasma Sintering ◽  
Spark Plasma

An NbTiHfCrAlSi niobium silicide based atomized powder has been compacted by a conventional technique (hot extrusion) and by spark plasma sintering to nearly fully dense alloys. Both materials exhibit a metastable fine micrometer-sized microstructure that has been coarsened by a subsequent heat treatment. The densification of the SPS sample takes place between ca. 800°C and 1300°C.

Diffusion welding of powder metallurgy high speed steel by spark plasma sintering

2020 ◽  
Vol 275 ◽  
pp. 116383 ◽  
Author(s):  
Weijun Shen ◽  
Linping Yu ◽  
Huixin Liu ◽  
Yuehui He ◽  
Zhe Zhou ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Spark Plasma Sintering ◽  
High Speed ◽  
High Speed Steel ◽  
Diffusion Welding ◽  
Plasma Sintering ◽  
Spark Plasma

Powder metallurgy of stainless steels and composites: a review of mechanical alloying and spark plasma sintering

2019 ◽  
Vol 102 (9-12) ◽  
pp. 3271-3290 ◽  
Author(s):  
Samuel Ranti Oke ◽  
Oladeji Oluremi Ige ◽  
Oluwasegun Eso Falodun ◽  
Avwerosuoghene M. Okoro ◽  
Mahlatse R. Mphahlele ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
Stainless Steels ◽  
Plasma Sintering ◽  
Spark Plasma

Structure of Nanocrystalline Nickel Prepared by Powder Metallurgy

2015 ◽  
Vol 647 ◽  
pp. 102-107
Author(s):  
Alena Michalcová ◽  
Petra Svobodová ◽  
Ivo Marek ◽  
Dalibor Vojtěch ◽  
Tomáš František Kubatík
Keyword(s):  
Powder Metallurgy ◽  
Spark Plasma Sintering ◽  
Selective Leaching ◽  
Heating Rates ◽  
Nanocrystalline Nickel ◽  
Preparation Conditions ◽  
Plasma Sintering ◽  
High Heating ◽  
Spark Plasma ◽  
Sintering Method

Nanocrystaline nickel was prepared by selective leaching technology. Consequently, the powder was compacted by spark plasma sintering method. This process is suitable due to its high heating rates, which leads to relatively low thermal exposition of compacted material. The dependence of structure of compacted material on preparation conditions is described in this paper.

scholarly journals Preparation of TiAl15Si15 alloy by High Pressure Spark Plasma Sintering

2018 ◽  
Vol 24 (2) ◽  
pp. 174
Author(s):  
Anna Knaislová ◽  
Pavel Novák ◽  
Filip Průša ◽  
Sławomir Cygan ◽  
Lucyna Jaworska
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Powder Metallurgy ◽  
Spark Plasma Sintering ◽  
Elevated Temperatures ◽  
Reactive Sintering ◽  
Compact Sample ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Sintering Method

<p class="AMSmaintext"><span lang="EN-GB">This work deals with preparation of intermetallic alloy TiAl15Si15 (wt. %) by powder metallurgy using Spark Plasma Sintering method. Ti-Al-Si alloys are known as materials with low density, relatively good mechanical properties in comparison with their density and good oxidation and corrosion resistance at elevated temperatures. Preparation of intermetallics by melting metallurgy is very problematic. Powder metallurgy using reactive sintering followed by suitable compaction seems to be a promising method. In this work, TiAl15Si15 alloy was prepared by reactive sintering, milling and by unique ultra-high pressure Spark Plasma Sintering within the framework of international cooperation in Krakow. For the comparison it was also prepared by conventional Spark Plasma Sintering. The results show that higher pressure of sintering decreases the porosity of compact sample and increases mechanical properties, especially hardness.</span></p>

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