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TEXTURE EVOLUTION DURING THE STATIC RECRYSTALLIZATION OF THREE BINARY MG-Y ALLOYS

机译:三种二元MG-Y合金静态再结晶过程中的织构演变

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The evolution of texture during the static recrystallization of three cold rolled binary Mg-Y alloys was characterised using electron backscattered diffraction (EBSD). It had been shown in previous studies that alloys that contain yttrium can develop more random texture, during thermo-mechanical processing and this can reduce or eliminate the yield asymmetry common to wrought magnesium alloy. The three alloys were initially hot rolled to break up the as cast structure then cold rolled using multiple passes of 1% reductions to avoid cracking and impart a high attainable level of stored energy. The as rolled texture was a typical basal texture with a small component outside the basal ring formed as a result of {10-11} - {10-12} double twinning. Isothermal annealing was carried out in 325°C at either 20 or 50 minutes to produce both partial and fully recrystallized structures. The texture produced after recrystallization was a weak basal texture. It was found that for all the alloys the orientations and boundary misorientation of the double twins was carried through to the recrystallized texture due to preferential recrystallization of the twinned regions which were extensive throughout the structure.
机译:使用电子背散射衍射(EBSD)表征了三种冷轧二元Mg-Y合金静态再结晶过程中的织构演变。先前的研究表明,含钇的合金在热机械加工过程中会形成更多的无规织构,这可以减少或消除变形镁合金常见的屈服不对称性。最初对这三种合金进行热轧以破坏铸态组织,然后通过多次减少1%的道次冷轧来避免开裂并赋予可达到的高储能水平。轧制后的织构是典型的基础织构,由于{10-11}-{10-12}双重孪生而在基底环外形成了很小的成分。等温退火在325°C下进行20或50分钟,以产生部分和完全重结晶的结构。重结晶后产生的质地是较弱的基础质地。发现对于所有合金,双晶孪晶的取向和边界失取向都贯穿到重结晶织构,这是由于在整个结构中广泛存在的孪晶区的优先重结晶。

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