Journal•ISSN: 0032-5899
Powder Metallurgy
Maney Publishing
About: Powder Metallurgy is an academic journal published by Maney Publishing. The journal publishes majorly in the area(s): Sintering & Powder metallurgy. It has an ISSN identifier of 0032-5899. Over the lifetime, 2266 publications have been published receiving 26588 citations.
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TL;DR: A short overview of works on spark plasma sintering (SPS) is given in the present paper as mentioned in this paper, however, the nature of activation effects, especially in its regards to acceleration of diffusion processes, is not clearly established.
Abstract: A short overview of works on spark plasma sintering (SPS) is given in the present paper. SPS is a newly developed rapid sintering technique with a great potential for achieving fast densification results with minimal grain growth in a short sintering time. It is proven by obtained experimental data that enhanced sinterability of powders subjected to SPS mainly associated with particle surface activation and increased diffusion rates on the contact zones caused by applied pulse current. Application of rapid heating results in bypassing of low temperature regions where surface transport controlled sintering is dominant. This preserves the powder surface area to temperature levels where bulk transport is significant. However, the nature of activation effects, especially in its regards to acceleration of diffusion processes, is not clearly established. A lot of research work reports about the occurrence of plasma during the application of pulse current. However, the appearance of thermal plasma during...
326 citations
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TL;DR: The Fe35Mn alloy was found to be essentially austenitic with fine MnO particles aligned along the rolling direction, and it exhibits antiferromagnetic behaviour and its magnetic susceptibility is not altered by plastic deformation, providing an excellent MRI compatibility.
Abstract: An Fe–35 wt-%Mn alloy, aimed to be used as a metallic degradable biomaterial for stent applications, was prepared via a powder metallurgy route. The effects of processing conditions on the microstructure, mechanical properties, magnetic susceptibility and corrosion behaviour were investigated and the results were compared to those of the SS316L alloy, a gold standard for stent applications. The Fe35Mn alloy was found to be essentially austenitic with fine MnO particles aligned along the rolling direction. The alloy is ductile with a strength approaching that of wrought SS316L. It exhibits antiferromagnetic behaviour and its magnetic susceptibility is not altered by plastic deformation, providing an excellent MRI compatibility. Its corrosion rate was evaluated in a modified Hank's solution, and found superior to that of pure iron (slow in vivo degradation rate). In conclusion, the mechanical, magnetic and corrosion characteristics of the Fe35Mn alloy are considered suitable for further development ...
282 citations
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TL;DR: In this article, the dependency of room temperature tensile ductility on oxygen was investigated for α-Ti, (α+β)-Ti and β-Ti alloys fabricated via traditional ingot metallurgy (IM), powder metallurgical (PM) and additive manufacturing (AM) or three-dimensional printing methods.
Abstract: Room temperature tensile ductility is an important property of titanium (Ti) and titanium alloys for structural applications This article reviews the dependency of tensile ductility on oxygen for α-Ti, (α+β)-Ti and β-Ti alloys fabricated via traditional ingot metallurgy (IM), powder metallurgy (PM) and additive manufacturing (AM) or three-dimensional printing methods and recent advances in understanding the effect of oxygen on ductility Seven mechanisms have been discussed based on case studies of individual titanium materials reported in literature The dependency of ductility on oxygen is determined by both the composition and microstructure of the titanium alloy For Ti–6Al–4V (wt-%), as sintered Ti–6Al–4V shows a critical oxygen level of about 0·33 wt-% while additively manufactured Ti–6Al–4V exhibits different critical levels ranging from about 0·22% to well above 0·4% depending on microstructure Rare earth (RE) elements are effective scavengers of oxygen in titanium materials even just wi
190 citations
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TL;DR: In this article, a model for describing the densification behavior of an irregular packing of spherical particles is developed based on a previous experimental study of particle deformation during powder compaction.
Abstract: Based on a previous experimental study of particle deformation during powder compaction, a model is developed for describing the densification behaviour of an irregular packing of spherical particles. Using the radial density function of a ‘random dense packing’, the increase in both the average size and the number of contact faces are calculated. A simple criterion for local yielding allows the compaction pressure to be determined for relative densities up to 90%. In the final stage of compaction, particle deformation, now constrained by neighbouring contacts, is modelled by extrusion into the remaining pore space. A compaction equation encompassing both stages is presented; its application to non-spherical powders elucidates the role of particle shape during powder densification. PM/0150
184 citations
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TL;DR: In this paper, experimental results relating to the influence of composition, structure, and testing conditions on the hardness, compressive strength, and transverse rupture strength of sintered tungsten carbide-cobalt alloys are presented.
Abstract: The paper reviews experimental results relating to the influence of composition, structure, and testing conditions on the hardness, compressive strength, and transverse rupture strength of sintered tungsten carbide–cobalt alloys.
169 citations