Topic
Alloy
About: Alloy is a research topic. Over the lifetime, 171884 publications have been published within this topic receiving 1719420 citations. The topic is also known as: alloys.
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TL;DR: In this paper, the thermal stability of CoCrFeNi high entropy alloy in as-milled and sintered conditions was investigated using X-ray diffraction, differential scanning calorimetry, transmission electron microscopy, and atom probe tomography.
183 citations
TL;DR: In this article, the equiatomic multiprincipal CoCrFeNiCuAl high-entropy alloy was prepared using a vacuum arc melt casting method and the as-cast alloy was subsequently annealed at 1000°C for 2h and the annealing effects on the structure and properties evolution were investigated.
183 citations
TL;DR: In this article, a spinel barrier layer was developed and tested on the ferritic stainless steel Crofer22 APU to protect cells from chromium poisoning and improve their performance.
Abstract: In intermediate solid oxide fuel cells, the use of cost effective chromia forming alloy interconnects such as ferritic stainless steels can lead to severe degradation in cell performance due to chromium migration into the cells at the cathode side. To protect cells from chromium poisoning and improve their performance, a Mn1.5Co1.5O4 spinel barrier layer has been developed and tested on the ferritic stainless steel Crofer22 APU. Thermal and electrical tests confirmed the effectiveness of the spinel protection layer as a means of stopping chromium migration and decreasing oxidation, while promoting electrical contact and minimizing cathode/interconnect interfacial resistance. The thermally grown spinel protection layer was well-bonded to the Crofer22 APU substrate and demonstrated stable performance under thermal cycling.
183 citations
TL;DR: In this article, results obtained on the performance of coatings deposited onto die-casting dies by magnetron sputtering and plasma assisted chemical vapour deposition are presented and discussed and compared with those of simulation tests using thermal cycling immersion tests in liquid aluminium, thermo-gravimetric analysis, and stress measurements during thermal cycling.
Abstract: In aluminium die casting, tools are exposed to erosion, corrosion and soldering due to the frequent contact of the tool surface to the casting alloy, to heat checking and gross cracking due to thermal fatigue and to oxidation due to high pouring temperatures. The gradual destruction of die surfaces during service decreases casting piece quality and limits die lifetime. Hard coatings based on nitrides or carbides of transition metals may protect the steel surface from erosion and soldering of aluminium and improve the resistance against thermal cracking. Thus, they may replace the thick oxide-based die coatings nowadays used in foundries. Within this study, results obtained on the performance of coatings deposited onto die-casting dies by magnetron sputtering and plasma-assisted chemical vapour deposition are presented and discussed. TiN, Ti(C,N), Ti(B,N), and (Ti,Al)(C,N) coatings deposited onto hot-working tool steel have been evaluated in practical die-casting service. Results obtained are compared with those of simulation tests using thermal cycling immersion tests in liquid aluminium, thermo-gravimetric analysis, and stress measurements during thermal cycling. Maximum lifetime of the coated casting die is achieved for careful optimization of hardness, adhesion, oxidation resistance and high temperature stability, and internal stresses.
183 citations
TL;DR: In this paper, shape memory properties of Ti-Nb-Mo alloys were investigated in order to enhance their superelasticity with Mo contents of 0, 1, 2 and 3.
183 citations