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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >The effect of Mg precipitation on the mechanical properties of 5xxx aluminum alloys
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The effect of Mg precipitation on the mechanical properties of 5xxx aluminum alloys

机译：镁沉淀对5xxx铝合金力学性能的影响

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摘要

Industrially produced continuous cast (CC) aluminum alloys AA5182 and AA5052 were heat-treated at a low temperature of 182 deg C for different times (30 and 100 h). Samples from the hot band (hot band in continuous cast process is produced through hot rolling of the materials at relatively high temperatures, usually from 490 to 310 deg C) and the heat-treated materials were prepared for microstructure examination, chemical composition analysis, electrical resistivity testing and tensile testing. Particle structures of CCS 182 alloy show precipitation along the grain boundaries after this low temperature heat-treatment. The particles were identified by SEM analysis to be Mg precipitates (Mg_2Al_3). Due to the Mg precipitation, electrical resistivity, elongation and ultimate tensile strength decreased. As the interaction between Mg solute atoms in solid solution and mobile dislocations decreases due to precipitation, the magnitude of the stress drop in the serrations decreases and the critical strain for the onset of serrated yielding increases in CCS 182 alloy. These phenomena do not occur in CC5052 alloy since precipitation either does not occur or is much weaker in this alloy. An inverse serrated yielding behavior, which is characterized by an increase in the critical strain for the onset of serrated yielding with a decrease in strain rate, occurs in CCS 182 alloy but not in CC5052 alloy. This inverse behavior is believed to be related to precipitation during tensile deformation in CCS 182 alloy.
机译：将工业生产的连续铸造（CC）铝合金A5182和A5052在182℃的低温下热处理不同的时间（30和100小时）。来自热轧带的样品（连续浇铸过程中的热轧带是通过在较高温度下（通常在490至310℃下）对材料进行热轧而生产的），并准备了经热处理的材料以进行微观结构检查，化学成分分析，电学分析。电阻率测试和拉伸测试。经过这种低温热处理后，CCS 182合金的颗粒结构显示出沿晶界的沉淀。通过SEM分析鉴定出该颗粒为Mg沉淀物（Mg_2Al_3）。由于镁的沉淀，电阻率，伸长率和极限拉伸强度降低。随着固溶Mg溶质原子与移动位错之间的相互作用由于沉淀而降低，锯齿中应力下降的幅度减小，CCS 182合金中产生锯齿状屈服的临界应变增加。这些现象在CC5052合金中不会发生，因为在该合金中不会发生沉淀或强度会大大降低。逆锯齿形屈服行为在CCS 182合金中而不是在CC5052合金中发生，其特征是锯齿屈服开始时的临界应变增加而应变速率降低。据信这种相反的行为与CCS 182合金拉伸变形过程中的析出有关。

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