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首页> 外文会议>High performance and optimum design of structures and materials >Microstructural and mechanical characterization of magnesium based alloy MA14 (ZK60 A): evolution under deformation and heat treatment
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Microstructural and mechanical characterization of magnesium based alloy MA14 (ZK60 A): evolution under deformation and heat treatment

机译：镁基合金MA14（ZK60 A）的微观结构和力学特性：变形和热处理下的演变

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摘要

The interest in magnesium based alloys as structural metal material is due to their low weight, good mechanical and technological properties, high special strength, etc. So magnesium base alloys can compete successfully in physical and mechanical characteristics with other light structural materials especially in the fields where decrease in the mass is of primary significance. The aim of the present work was to study the influence of phase and structural changes in the main properties of commercial magnesium based alloy MA14 (ZK60 A) under deformation and heat treatment parameters. The microstructure was investigated with the use of an optical inverted microscope. The phase composition was investigated by chemical phase analysis with an X-ray analysis of each insulated phase. It is found, that there are primary phases Mg_2Zn_3, ZrZn_2 and Zr_3Zn_2. Sometimes phases ω-ZrH_2, δ-ZrH, Zr_2Al can be present in phase composition. All the phases are the hardening ones. The phase quantity, size, morphology correlate with the condition of the magnesium alloy so traditional deformation and heat treatment has not had much influence on qualitative phase composition; only on the phase and grain size. Now it is stated that the most effective processing for receiving the elevated alloy properties is hydrostatic extrusion. The final operation of hydrostatic extrusion of magnesium alloy semi products causes the well-disposed structure and phase changes. Thus the high strength properties of the cheap commercial magnesium alloy MA14 are obtained: tensile strength is more than 380 MPa; tensile yield strength is more than 340 MPa.
机译：对镁基合金作为结构金属材料的兴趣是由于它们的轻质，良好的机械和工艺性能，高的特殊强度等。因此，镁基合金可以在物理和机械特性方面与其他轻型结构材料成功竞争，特别是在领域质量的降低是最重要的。本工作的目的是研究相变和结构变化对商用镁基合金MA14（ZK60 A）在变形和热处理参数下的主要性能的影响。使用光学倒置显微镜研究了微观结构。通过化学相分析和每个绝缘相的X射线分析来研究相组成。发现存在初级相Mg_2Zn_3，ZrZn_2和Zr_3Zn_2。有时相组成中可能存在相ω-ZrH_2，δ-ZrH，Zr_2Al。所有阶段都是硬化阶段。相的数量，大小，形态与镁合金的状态有关，因此传统的变形和热处理对定性相的组成影响不大。仅关于相和晶粒尺寸。现在指出，获得提高的合金性能的最有效方法是静液压挤压。镁合金半成品的静液压挤压的最终操作导致结构良好的相变。因此，获得了廉价的商品镁合金MA14的高强度性能：抗张强度大于380MPa；抗拉强度大于380MPa。拉伸屈服强度大于340 MPa。

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