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摘要本课题对Al-2.2Ti-0.55C-0.8B中间合金进行不同程度的变形处理，通过一系列分析测试方法对其微观组织的变化进行观察研究，并进一步通过纯铝细化实验对变形后中间合金的晶粒细化能力进行了测试。25897
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实验发现，在变形量小于60%时，基体上的第二相粒子团会因变形由聚集状态分散，并逐渐弥散在基体上。随着变形量的增大，达到90%，95%时，TiCxBy和TiB2粒子会发生轻微破碎，但其在基体上的分布更加弥散。在变形量达到99%时，已经有相当一部分TiCxBy和TiB2粒子破碎，其粒子尺寸越来越小。
细化实验结果表明，当变形量在一定程度范围内时（小于60%）随着变形量的增大，第二相粒子逐渐趋于弥散状态，其细化效果和抗衰退性能会逐渐增强。但随着变形量持续增大，达到90%，95%时，其弥散程度更高，抗衰退性能更强，但细化性能降低。变形量达到99%时，其细化效果和抗衰退性能均会呈下降趋势。
关键词 Al-Ti-C-B中间合金；晶粒细化；变形处理；TiCxBy；TiB2
毕业论文设计说明书外文摘要
Title Effect of deformation treatment on the microstructure of Al-Ti-C-B master alloys and its grain refining efficiency
Abstract
In the present study, the different degrees of deformation treatment on Al-2.2Ti-0.55C-0.8B master alloys , The effect of deformation on the microstructure of the master alloy has been studied by a series of analysis methods, such as FESEM and XRD and so on.Furthermore, the grain refining performance of master alloy with different deformation process have also been carried out on commercial pure aluminum.
It is found that when the amount of deformation less than sixty percent, the second phase particles group in the base will be dispersed form the state of aggregation, and then dispersed in the matrix gradually. When the degree of deformation rising into ninety percent or ninety five percent, the TiCxBy and TiB2 particles will broken slightly, but it will more diffuse. When the level into ninety nine percent, there already considerable part of TiCxBy and TiB2 were broken and the size of the grains getting smaller.
It is also found that when the amount of deformation in the range of a certain extent(less than sixty percent), the particles will be dispersed gradually with the increase of the degree, the grain refinement and the recession-resistant performance of the master alloys will increase gradually. When the level rising into ninety percent or ninety five percent, the grain refinement of the alloys will be better, but the recession-resistant performance will be worse. The degree of deformation was ninety nine percent, both will be worse .
Keywords the Al-Ti-C-B master alloys; grain refinement; deformation processing; TiCxBy; TiB2
目 次
1 绪论 3
1.1 铝及铝合金的介绍 3
1.2 铝合金细化剂的发展及研究现状 3
1.2.1 铝合金细化剂的发展 3
1.2.2 铝合金细化剂的研究现状 4
1.3 铝合金细化剂的细化原理 4
1.4 课题的意义 5
1.5 课题内容 5
2 实验方法 7
2.1 实验材料 7
2.2 实验设备与仪器 7
2.3 实验过程 7
2.3.1 样品准备 7
2.3.2 轧制处理 7