基于伺服压力机镁合金冷压缩组织和硬度研究

发布时间：2018-03-29 01:22

本文选题：镁合金　切入点：伺服压力机　出处：《材料科学与工艺》2015年03期

【摘要】：为研究变速变形对镁合金微观组织和硬度的影响,采用1 100 k N机械伺服压力机,对AZ31镁合金在曲柄匀速驱动和曲柄单向减速驱动两种模式下进行了室温压缩实验,分析了两种速度模式不同变形量下试样的微观组织与硬度演化规律.研究表明:两种变速模式下,在压缩初始阶段,均有少量平行孪晶产生于粗大晶粒内,且孪晶宽度大;随着变形量增大,孪晶密度增大且呈细长化.在曲柄匀速驱动模式下,孪晶长而细且分布散乱,无规则交错;而曲柄单向减速驱动模式下孪晶由宽大转变为细长,多组平行孪晶相互交叉,均匀分布且孪晶密度增大.不同变形量下,曲柄单向减速驱动模式下的试样硬度均小于曲柄匀速驱动模式,但在接近极限压缩量(25%)时,其硬度值又趋于相同.
[Abstract]:In order to study the effect of variable speed deformation on microstructure and hardness of magnesium alloy, room temperature compression experiments were carried out on AZ31 magnesium alloy under two modes of crankcase uniform speed drive and crank unidirectional deceleration drive using 1 100kN mechanical servo press. The evolution law of microstructure and hardness of samples under two velocity modes and different deformations are analyzed. The results show that in the initial stage of compression, a few parallel twins occur in coarse grains and the width of twins is large. With the increase of deformation, the twinning density increases and becomes slender. In the crankshaft drive mode, the twins are long, thin, scattered and irregular, while the twinning changes from wide to slender in the one-way deceleration drive mode of crank. Multiple parallel twins intersect with each other, with uniform distribution and increased twin density. Under different deformation quantities, the hardness of the specimens in the one-way deceleration drive mode of crank is smaller than that in the constant speed drive mode of crank, but near the limit compression value of 25). Its hardness value tends to be the same.
【作者单位】：广东工业大学材料与能源学院;
【基金】：国家自然科学基金资助项目(51205065) 广东省自然科学基金资助项目(S2012010009730) 广东省战略性新兴产业发展专项项目(2012A090100014)
【分类号】：TG306;TG146.22

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