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In situ differential scanning calorimetry analysis of dissolution and precipitation kinetics in Mg-Y-RE alloy WE43

Journal of Magnesium and Alloys 2019年第1期7卷 1-14页

作者： benjamin milkereit Lydia Burgschat Richard H.Kemsies Armin Springer Christoph Schick Olaf Kessler Chair of Materials Science Faculty of Mechanical Engineering and Marine TechnologyUniversity of RostockGermany Competence CentreCALOR-Calorimetry and Thermal Analysis Rostock Department LifeLight&MatterInterdisciplinary FacultyUniversity of RostockGermany Medical Biology and Electron Microscope Centre University Medical Centre RostockGermany Institute of Physics Polymer Physics GroupUniversity of RostockGermany

Further development of our differential scanning calorimetry(DSC)method for the analysis of solid-solid phase transformations now also allows for its application in the kinetic analysis of age hardening in Mg *** a result,the state-of-the-art for DSC on Mg alloys has been improved with respect to the accessible temperature range,zero-level accuracy and dynamic *** analysis was performed on the example of Mg wrought alloy *** DSC experiments on the initial condition T4 and even direct continuous cooling DSC analysis on the kinetics of quench induced precipitation during cooling from solution treatment were possible,covering a dynamic range of 0.01-3 K/*** DSC findings are discussed with respect to literature knowledge and scanning electron microscopy analysis of the defined heat treatment states.

关键词： Precipitation Dissolution Kinetics DSC Magnesium alloy WE43 SEM Quench induced precipitation Continuous cooling

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Continuous cooling precipitation diagram of cast aluminium alloy Al-7Si-0.3Mg

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Transactions of Nonferrous Metals Society of China 2014年第7期24卷 2025-2033页

作者： benjamin milkereit Hannes FRCK Christoph SCHICK Olaf KESSLER Chair of Materials Science Faculty of Mechanical Engineering and Marine TechnologyUniversity of Rostock Polymer-Physics Group Institute of Physics University of Rostock

The precipitation behaviour during quenching of cast Al-7Si-0.3Mg aluminium alloy was investigated by DSC in the cooling rate range of 0.01 K/s to 3 K/s and by quenching dilatometry for higher rates. Two main precipitation reactions were observed during cooling, a high temperature reaction starting almost directly with quenching from 540℃ and a low temperature reaction starting at about 400℃. Quenching with 3 K/s already significantly suppresses precipitation during quenching. Hardness after T6 ageing increases with increasing quenching rate, due to the increasing content of supersaturated solid solution. By dilatometry and hardness results the critical cooling rate can be estimated as about 60 K/s. Quenched Al-7Si-0.3Mg microstructures have been investigated by light microscopy. The microstructures consist of an aluminium-silicon eutectic structure, aluminium solid solution dendrites and precipitates inside the aluminium dendrites, depending on quenching rate.

关键词： cast aluminium alloy Al-7Si-0.3Mg quenching continuous cooling precipitation diagram differential scanningcalorimetry critical cooling rate

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Continuous cooling precipitation diagram of high alloyed Al-Zn-Mg-Cu 7049A alloy

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Transactions of Nonferrous Metals Society of China 2014年第7期24卷 2018-2024页

作者： Davit ZOHRABYAN benjamin milkereit Christoph SCHICK Olaf KESSLER Chair of Materials Science University of Rostock Polymer-Physics Group University of Rostock

The precipitation behaviour during cooling from solution annealing of high alloyed 7049A aluminium alloy was investigated, covering the complete cooling-rate-range of technical interest. This ranges from slow cooling rates close to equilibrium up to rates above complete supersaturation and is covering seven orders of magnitude in cooling rate （0.0005 to 5000 K/s）. The continuous cooling precipitation behaviour of 7049A alloy was recorded by combining different differential scanning calorimetry （DSC） techniques and microstructure analysis by SEM and Vickers hardness testing. The high alloyed, high strength and quench sensitive wrought aluminium alloy 7049A was investigated during quenching from solution annealing by conventional DSC in the cooling rate range of 0.0005 to 4 K/s. In this range at least two exothermal precipitation reactions were observed： a high temperature reaction in a narrow temperature interval of 450-430℃, and a low temperature reaction in a broad temperature interval down to about 200 ℃. Intensities of both reactions decreased with increasing cooling rate. Quenching from solution annealing with rates up to 1000 K/s was investigated by differential fast scanning calorimetry （DFSC） and the differential reheating method （DRM）. A critical quenching rate to suppress all precipitation reactions of 100-300 K/s was been determined.

关键词： differential scanning calorimetry (DSC) differential fast scanning calorimetry (DFSC) 7049A alloy differentialreheating method continuous cooling precipitation

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