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: A chromium-free conversion coating for AZ91D magnesium alloy has been obtained by using a phosphate-permanganate solution, which has been developed out without acid pickling as discussed by the authors.
Abstract: A chromium-free conversion coating for AZ91D magnesium alloy has been obtained by using a phosphate–permanganate solution, which has been developed out without acid pickling. Examinations have been carried out on the conversion coatings for morphology, composition, adhesion force, and corrosion resistance. Results show that the conversion coatings are relatively uniform and continuous, with thickness from 7 μm to 10 μm. They demonstrate good adhesion to matrix and have some non-penetrating tiny holes on the surface. The main elements of the conversion coating of AZ91D alloy are Mg, O, P, K, Al and Mn by EPMA analysis. Results of corrosion resistance test indicate that the corrosion resistance of the conversion coating by phosphate–permanganate solution is matched to that of the conversion coating by traditional chromate solution, but for the corrosion resistance after painting, the former is better than the later.
166 citations
TL;DR: In this article, a calorimeter has been constructed for the determination of exothermic heats of alloying, and the results of this measurement agree with those obtained by Oelsen and Middel using quite a different method.
165 citations
25 Sep 2003-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, a process for increasing both strength and ductility in a brittle Al-5 wt.% Fe alloy by Equal Channel Angular Pressing (ECAP) was investigated.
Abstract: A process for increasing both strength and ductility in a brittle Al–5 wt.% Fe alloy by Equal Channel Angular Pressing (ECAP) was investigated. The increase in solid solubility of iron in the Al matrix produced by intense deformation under ECAP permitted age hardening in this alloy although it is not hardenable by conventional processing. An ultrafine-grained microstructure of 325–450 nm was obtained in a brittle, cast Al–5 wt.% Fe alloy by ECAP with various numbers of passes and backpressure levels from 40 to 275 MPa. A supersaturated solid solution with a maximum solubility of 0.6 wt.% of iron in an aluminium matrix was obtained during ECAP, which allowed ageing of the conventionally non-hardenable alloy. Strength, ductility and microhardness of the cast alloy processed by the ECAP technique were significantly enhanced (e.g. strength and ductility from 102 MPa and 3.4% to 261 MPa and 5.8%, respectively). The subsequent artificial ageing resulted in a further increase in strength to 272 MPa. It was shown by scanning electron microscopy (SEM) that the type of fracture of tensile specimens taken from material subjected to ECAP was predominantly ductile. An increase in backpressure retards cracking of intermetallic particles and enhances the workability and ductility of such alloys processed by ECAP.
165 citations
TL;DR: In this article, the photoelectric emission of these films was investigated and it was found that equilibrated alloys of compositions within the miscibility gap of the PtAu phase diagram possessed identical work functions.
165 citations
TL;DR: In this article, the additive manufacturing of the AlSi10Mg alloy has become the subject of considerable attention, especially for production of complex parts in engines, but as yet little is known about it in relation to AM.
165 citations