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Investigation on mechanical properties and creep behavior of stir cast AZ91-SiC_(p) composites

Journal of Magnesium and Alloys 2015年第1期3卷 16-22页

作者： Abhilash Viswanath h.dieringa K.K.Ajith Kumar U.T.S.Pillai B.C.Pai CSIR-National Institute for Interdisciplinary Science and Technology Material Science and Technology DivisionThiruvananthapuram 695019India MagIC-Magnesium Innovation Centre Helmholtz-Zentrum GeesthachtMax-Planck-Strasse 1D-21502 GeesthachtGermany

The room temperature mechanical properties and high temperature creep behavior of AZ91 alloy reinforced with SiC_(p) synthesized via stir casting have been *** mechanical properties showed improvement with respect to the amount of reinforcement *** creep testing of the composites carried out at a temperature of 175 ℃ under constant stress of 80,100 and 120 MPa reveals different creep characteristics depending upon the reinforcement content and the applied *** true stress exponents of different composites calculated from minimum creep rate indicate the possible mechanisms of creep deformation.

关键词： Composites Optical microscopy Mechanical properties Creep characteristics

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hot forging of Mg-4Al-2Ba-2Ca(ABa X422) alloy and validation of processing map

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Transactions of Nonferrous Metals Society of China 2018年第8期28卷 1495-1503页

作者： K.SURESh K.P.RAO Y.V.R.K.PRASAD N.hORT h.dieringa Department of mechanical and Biomedical Engineering City Uiliversity of Hong Kong Tat Chee Avenue Kowloon Hoilg Koilg China *** No. 2/B vinayaka Nagar Hebbal Bengalum 560024 India helmholtz-zentrum Geesthacht institute of Materials ResearchMagnesium innovation Centre Max-Planck-StraBe 1 Geesthacht 21502 Germany

A cup-shaped component of Mg-4 Al-2 Ba-2 Ca（ABa X422） alloy was forged in the temperature range of 300-500 °C and at speeds in the range of 0.01-10 mm/s with a view to validate the processing map and study the microstructural development. The process was simulated through finite-element method to estimate the local and average strain rate ranges in the forging envelope. The processing map exhibited two domains in the following ranges：（1） 300-390 °C and 0.0003-0.001 s^-1, and（2） 400-500 °C and 0.0003-0.3 s^-1 and both represented dynamic recrystallization（DRX）. The map revealed a wide flow instability regime at higher strain rates and temperatures lower than 400 °C, in which flow localization occurred. Forgings produced under conditions of the above two domains were sound and symmetrical, and had finer grain sizes when being forged in the first domain. however, when being forged in the flow instability regimes, the alloy fractured before the final shape was reached. The experimental load-stroke curves for the conditions within the domains correlated well with the simulated ones, whereas the curves obtained in the instability regime were uneven.

关键词： magnesium alloy, processing map hot forging dynamic recrystallization

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Microstructural evolution of Mg-14Gd-0.4Zr alloy during compressive creep

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Journal of Magnesium and Alloys 2023年第9期11卷 3161-3173页

作者： hui Shi Yuanding huang Lixiang Yang Chunquan Liu hajo dieringa Chong Lu Lv Xiao Regine Willumeit-Römer Norbert hort Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax-Planck-Str.1Geesthacht 21502Germany Research and Development Center Shanghai Spaceflight Precision Machinery Research InstituteShanghai 201600China School of Mechanical Engineering Guizhou UniversityGuiyang 550025China Institute of Material and Process Design Helmholtz-Zentrum HereonMax-Planck-Str.1Geesthacht 21502Germany The Instrument Analysis Center Shanghai Jiaotong UniversityShanghai 200240China Institute of Product Technology and Systems Leuphana University LüneburgUniversitätsallee 1Lüneburg D 21335Germany

The present work reports the creep behavior and microstructural evolution of the sand-cast Mg-14Gd-0.4Zr alloy(wt.%) prepared by the differential pressure casting machine. Their compressive creep tests at 250 ℃ were performed under various applied stresses(i.e., 60, 80 and100 MPa). Among them, the sand-cast Mg-14Gd-0.4Zr samples examined under 250 ℃/80 MPa for 39 and 95 h, respectively, were chosen to systemically analyze their creep mechanisms using high-angle annular dark field-scanning transmission electron microscopy(hAADF-STEM).The obtained results showed that the enhancement of creep resistance can be mainly attributed to the coherent β' and β'_F phases with an alternate distribution, effectively impeding the basal dislocations movement. however, with the creep time increasing, the fine β'+β'_F precipitate chains coarsened and transformed to semi-coherent β_1 phase and even to large incoherent β phase(surrounded by precipitate-free areas) in grain interiors. The precipitate-free zones(PFZs) at grain boundaries(GBs) were formed, and they could expand during creep deformation. Apart from the main cross-slip of basal and prismatic dislocations, type dislocations were activated and tended to distribute near the GBs. The aforementioned phenomena induced the stress concentrations, consequently leading to the increment of the creep strain.

关键词： Magnesium alloys Creep property Microstructures Precipitate chains Dislocation

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