The Experts below are selected from a list of 3465 Experts worldwide ranked by ideXlab platform

Astrid Marie F Muggerud - One of the best experts on this subject based on the ideXlab platform.

  • Dispersion Hardening effect of dispersoids in 3xxx al alloys with varying manganese and silicon contents
    ICAA13: 13th International Conference on Aluminum Alloys, 2012
    Co-Authors: Eva Anne Mortsell, Astrid Marie F Muggerud, Randi Holmestad
    Abstract:

    For non-heat treatable wrought aluminium alloys the strengthening occurs from solid solution Hardening and work Hardening. The goal of this paper is to study the Dispersion Hardening effect of dispersoids precipitated during low temperature annealing. The size, number density and morphology of dispersoids in four selected AA3xxx aluminium alloys with different Si and Mn contents after annealing at different temperatures and for different times are quantitatively studied. The microstructure is correlated with the strength in terms of micro hardness. It is revealed that the dispersoids have a remarkable contribution to the strength of the alloys. The Hardening effect of dispersoids increases with increasing Mn and Si content in the alloys.

  • precipitation of partially coherent α al mn fe si dispersoids and their strengthening effect in aa 3003 alloy
    Acta Materialia, 2012
    Co-Authors: Astrid Marie F Muggerud, A Olsen, T Furu
    Abstract:

    Abstract The orientation relationship (OR) between α-Al(Mn,Fe)Si dispersoids and the Al matrix in AA 3003 alloy has been systematically studied by selected area electron diffraction patterns. New types of ORs between the cubic dispersoids and the cubic matrix phase have been found as 〈1 −1 1〉 p //〈1 −1 1〉 m and {5 −2 −7} p //{0 1 1} m . High-resolution transmission electron microscopy and crystal structure simulation studies on the habit planes of dispersoids show that α-Al(Mn,Fe)Si dispersoids are partially coherent with the Al matrix. Precipitation of α-Al(Mn,Fe)Si dispersoids in the alloy has been found to have a strong influence on enhancing both the yield strength and tensile strength of the alloy. The Dispersion-Hardening effect of the dispersoids has been explained by the Orowan mechanism.

  • ICAA13: 13th International Conference on Aluminum Alloys - Dispersion Hardening Effect of Dispersoids in 3xxx Al Alloys With Varying Manganese and Silicon Contents
    ICAA13 Pittsburgh, 2012
    Co-Authors: Eva Anne Mortsell, Astrid Marie F Muggerud, Randi Holmestad
    Abstract:

    For non-heat treatable wrought aluminium alloys the strengthening occurs from solid solution Hardening and work Hardening. The goal of this paper is to study the Dispersion Hardening effect of dispersoids precipitated during low temperature annealing. The size, number density and morphology of dispersoids in four selected AA3xxx aluminium alloys with different Si and Mn contents after annealing at different temperatures and for different times are quantitatively studied. The microstructure is correlated with the strength in terms of micro hardness. It is revealed that the dispersoids have a remarkable contribution to the strength of the alloys. The Hardening effect of dispersoids increases with increasing Mn and Si content in the alloys.

Kaneaki Tsuzaki - One of the best experts on this subject based on the ideXlab platform.

  • effects of α phase precipitation on crevice corrosion and tensile strength in ti 15mo alloy
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2010
    Co-Authors: Satoshi Emura, T Nishimura, Ling Zhang, S Tamilselvi, Koichi Tsuchiya, Kaneaki Tsuzaki
    Abstract:

    Abstract The effects of the α phase precipitation on the crevice corrosion at 373 K and the tensile properties at ambient temperature were investigated in the Ti–15Mo alloy. Relatively coarse α phase precipitates with the depletion of Mo formed in the alloy after aging at 873 K. The aged alloy maintained high crevice corrosion resistance in the 10% NaCl water solution with a pH value of 0.5 at 373 K, and showed much higher yield strength than that of the solution treated alloy. This increase in yield strength was mainly attributed to the change in the deformation mode of the β phase from the {332}〈113〉 twinning to the slip caused by the enrichment of Mo in the β phase, and contributions of the precipitation/Dispersion Hardening and the grain refinement strengthening are negligible. The yield strength decreased with an increase in the volume fraction of the α phase since the α phase is softer than the β phase which was confirmed by nanohardness measurements.

T N Baker - One of the best experts on this subject based on the ideXlab platform.

J Pezda - One of the best experts on this subject based on the ideXlab platform.

  • t6 heat treatment of hypo eutectic silumins in aspect of improvement of r m tensile strength
    Archives of Foundry Engineering, 2012
    Co-Authors: J Pezda
    Abstract:

    Improvement of properties of silumins in scope of classic methods is connected with changes in morphology of silicon precipitation through: process of modification of alloy, maintaining a suitable temperature of overheating and pouring into moulds, as well as perfection of heat treatment processes. Obtained structure of casting have a direct influence on mechanical and technological properties of machinery parts, and therefore, usage of knowledge on crystallization to control of crystallization’s kinetics of castings in order to optimize obtained structure and introduction of modern methods of heat treatment, enabling considerable improvement of mechanical and technological properties, becomes an important factor. Dispersion Hardening with soaking of alloy near temperature of solidus, consisting in heating of poured specimens to temperature of solutioning, keeping in such temperature, cooling down in cold water (20 0 C), and next operation of artificial ageing have effect on change of tensile strength Rm of a selected hypo-eutectoid silumins. Selection of suitable parameters of Dispersion Hardening is condition of obtainment of positive results in terms of improvement of tensile strength Rm and has effect on its economic aspects.

  • predicting of mechanical properties of en ab 46000 alloy subjected to Dispersion Hardening
    Archives of Foundry Engineering, 2011
    Co-Authors: J Pezda
    Abstract:

    Improvement of silumin properties in range of classic methods involves change of morphology of silicon precipitation through: modification treatment of the alloy, maintaining suitable temperature when superheating and pouring into moulds, as well as perfection of heat treatment processes. Dispersion Hardening with holding of the alloy in temperature near to temperature of solidus, consisting in heating of poured specimens up to temperature of solutioning, holding the specimens in such temperature, and next cooling down in cold water (20 0 C) and next artificial ageing, what have effect on change of mechanical properties of EN AB-46000 alloy, while selection of suitable parameters of Dispersion Hardening treatment is a condition of obtainment of positive effects in form of improved mechanical properties. Obtained dependencies enable determination of mechanical properties of the investigated alloy before commencing of solutioning and ageing treatments.

  • effect of Dispersion Hardening process on change of r m tensile strength of en ac 46000 alloy
    2010
    Co-Authors: J Pezda
    Abstract:

    Heat treatment of aluminum alloys is performed mainly to increase mechanical properties of the alloys. Very important issue, from improvement of mechanical properties point of view as well as economical aspects of performed treatment, is selection of a suitable parameters of solutioning and ageing operations. The paper presents results of the investigations concerning effect of the performed heat treatment on change of tensile strength of the EN AC-46000 (AlSi9Cu3) alloy. Investigated alloy was melted in electric resistance furnace. Run of crystallization is presented with making use of the thermal derivative method (ATD). This method was also implemented to determination of heat treatments’ temperature range of the alloy. Performed heat treatment resulted in growth of the Rm tensile strength. Performed tests have enabled determination of temperature and duration of solutioning and ageing operations of the investigated alloy, which would condition obtainment of improved Rm tensile strength. The tests were performed in laboratory conditions.

  • effect of Dispersion Hardening on impact resistance of en ac alsi12cu2fe silumin
    Archives of Foundry Engineering, 2009
    Co-Authors: J Pezda
    Abstract:

    Development of modern technology have generated supply of better and better, more resistant structural materials not attainable earlier. Weight of metal structures is of a great importance, and as a consequence, also weight of materials used for a given structure. More often, for metal structures are used lightweight metals and their alloys, from which aluminum and its alloys have become the most widespread. These alloys, based on Al-Si equilibrium system, contain additional constituents (e.g.: Mg, Cu) enabling, except modification, improvement of mechanical properties obtained in result of heat treatment. The paper presents an effect of modification process and heat treatment on impact resistance of EN AC-AlSi12Cu2Fe alloy. Solutioning and ageing temperatures were selected on base of registered curves of the ATD method. For the neareutectic EN AC-AlSi12Cu2Fe silumin one obtained growth of the impact resistance both due to performed modification treatment and performed heat treatments of the alloy.

  • effect of Dispersion Hardening process on machinability of en ab alsi9mg silumin
    Archives of Foundry Engineering, 2009
    Co-Authors: J Pezda
    Abstract:

    Nowadays, aluminum and its alloys found their application in any type design structures, many’s the time being an alternative for a ferrous alloys due to their technological properties like low density, ductility, high strength and good corrosion resistance. Among different fabrication processes the machining stage has a significant importance considering fabrication costs and processing time. Therefore, optimization of the process parameters that affect machining stages such as, tool wear, alloy machinability, machining effort and cutting speed becomes an area of constant development and study. To the most important factors having impact on machining properties belong: initial condition of machined material, which depends on a method and conditions of material preparation. In the paper are presented initial tests of machining properties of the EN AB-AlSi9Mg silumin subjected to heat treatment. Machinability measurements of the investigated alloy were performed with use of reboring method with constant force of feed. It enabled determination of an effect of heat treatment on machining properties of the investigated alloy. A further investigation shall be connected with determination of optimal parameters of solutionizing and ageing treatments in aspects of improvement of both mechanical properties and its machinability.

Eva Anne Mortsell - One of the best experts on this subject based on the ideXlab platform.