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首页> 外文期刊>Materials Science and Engineering >Significant strengthening in superlight Al-Mg alloy with an exceptionally large amount of Mg (13 wt%) after cold rolling
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Significant strengthening in superlight Al-Mg alloy with an exceptionally large amount of Mg (13 wt%) after cold rolling

机译：冷轧后以超大量的Mg（13 wt％）在超轻Al-Mg合金中显着增强

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摘要

Cold rolling could be successfully applied to an Al-Mg alloy with an exceptionally high amount of Mg (13 wt%) by effectively removing the Al3Mg2 phases; this removal was performed before cold rolling using solid solution treatment before extrusion and re-solid solution treatment after extrusion. The microstructures and the tensile properties of the Al-13Mg alloy were compared with those of the Al-Mg alloys with lower amounts of Mg (5-10 wt%), which were prepared following the same processing route. As the Mg content increased, the density of shear bands crossing each other increased during cold rolling, leading to more effective breakup of the initial coarse grains and development of nanosized cell structures and ultrafine grains, and a higher accumulation of dislocation density in the matrix. This result occurred because dynamic recovery was suppressed by the decrease of stacking fault energy and dislocation slip mobility due to the addition of Mg amount. The cold rolled Al-13Mg alloy, which is lighter than pure aluminum by 8.2%, exhibited a yield stress of 653 MPa, a maximum strength of 733 MPa and a total (uniform) tensile elongation of 5.1%. These strength values are superior to those of the conventional Al-Mg alloys with lower Mg contents (= 7 wt%) processed by severe plastic deformation via equal channel angular pressing. The analysis of the strengthening mechanisms of the cold rolled Al-13Mg alloy indicates that the strengthening effect by generation and arrangement of dislocations is more significant that solid solution strengthening.
机译：通过有效地去除Al3Mg2相，冷轧可以成功地应用于含Mg非常高（13 wt％）的Al-Mg合金。该去除是在冷轧之前在挤出之前进行固溶处理而在挤出之后进行再固溶处理的。将Al-13Mg合金的显微组织和拉伸性能与采用相同工艺路线制备的Mg含量较低（5-10 wt％）的Al-Mg合金进行了比较。随着Mg含量的增加，冷轧过程中彼此交叉的剪切带密度增加，从而导致初始粗晶粒更有效地破裂，纳米尺寸的细胞结构和超细晶粒的发展，以及位错密度在基体中的积累更多。产生该结果的原因是，由于增加了Mg，堆垛层错能量的降低和位错滑移迁移率的降低抑制了动态恢复。比纯铝轻8.2％的冷轧Al-13Mg合金的屈服应力为653 MPa，最大强度为733 MPa，总（均匀）拉伸伸长率为5.1％。这些强度值优于具有较低Mg含量（<= 7 wt％）的常规Al-Mg合金的强度，这些合金是通过等径角压制通过严重的塑性变形加工而成的。对冷轧Al-13Mg合金的强化机理分析表明，位错的产生和排列所产生的强化作用比固溶强化更为显着。

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