In this study, the extruded Mg-Zn-Mn-Ce-Ca alloy tube with a low compression anisotropy along the ED, 45ED and TD was prepared. The effect of the second phases, initial texture and deformation behavior on this low mechanical anisotropy was investigated. The results revealed that the alloy tube contains the high content (MgZn)Ce phase and the low content of MgCe phase. These second phases are respectively incoherent and coherent with the Mg matrix, and their influence can be ignored. Additionally, the alloy tube exhibited a weak basal fiber texture, where the c-axis was aligned along the 0° ∼ 30° tilt from TD to ED. Such a texture made the initial deformation (at 1.0% ∼ 1.6% strain) of the three samples controlled by comparable basal slip. As deformation progressed (1.6∼9.0% strain), larger amounts of ETWs nucleated and gradually approached saturation in the three samples, re-orienting the c-axis to a 0°∼±30° deviation with respect to the loading directions. Meanwhile, the prismatic 〈a〉 and pyramidal slips replaced the dominant deformation progressively until fracture. Eventually, the similar deformation mechanisms determined by the weak initial texture in the three samples contribute to the comparable strain hardening rates, resulting in the low compressive anisotropy of the alloy tube.

中文翻译：

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挤压Mg-Zn-Mn-Ce-Ca合金管压缩过程中低力学各向异性的研究

在本研究中，制备了沿ED、45ED和TD方向具有低压缩各向异性的挤压Mg-Zn-Mn-Ce-Ca合金管。研究了第二相、初始织构和变形行为对这种低机械各向异性的影响。结果表明，合金管中含有高含量的(MgZn)Ce相和低含量的MgCe相。这些第二相分别与Mg基体不相干和相干，其影响可以忽略不计。此外，合金管表现出弱的基底纤维织构，其中c轴沿着从TD到ED的0°～30°倾斜排列。这样的织构使得三个样品的初始变形（1.0%∼1.6%应变）受到可比的基底滑移的控制。随着变形的进行（1.6∼9.0%应变），三个样品中大量的ETW成核并逐渐接近饱和，将c轴重新定向到相对于加载方向的0°∼±30°偏差。同时，棱柱形 <a> 和金字塔形滑移逐渐取代了主要变形直至断裂。最终，三个样品中由弱初始织构决定的相似变形机制有助于形成可比的应变硬化率，从而导致合金管的压缩各向异性较低。