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摘要本课题通过对轧制变形量及温度的控制，对Al-5Ti-0.3C-0.2B中间合金进行系列变形处理；通过一系列分析测试手段对其微观组织的变化进行研究，并进一步通过细化试验对各组样品对工业纯铝的晶粒细化效果进行了测试。23718
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试验发现，无论是冷轧还是一定温度的热轧（300℃），当变形量低于60％时，Al-Ti-C-B中间合金中的板片状TiAl3相均发生明显地破碎断裂，同时，TiCxBy和TiB2颗粒在基体中的分布也得到一定程度地改善；随着变形量的增加，当变形量达90％以上，一些尺寸较大的TiB2、TiCxBy粒子本身也发生一定程度的破碎现象，第二相尺寸大大降低，分布更加弥散，且随变形量的增大而组织改善效果更佳明显。
细化试验结果表明，轧制变形对中间合金的细化效果也产生了一定程度的影响。较低变形量可以促使中间合金的细化效果得到一定程度的改善；随着变形量的增加(冷轧变形量高于60%)，中间合金的晶粒细化效果又逐渐变差。与冷轧变形相比，300℃的热轧制处理得到同等变形量的中间合金，其细化效果较差。特别是，通过叠轧处理，使变形量进一步提高到99.7％时，中间合金的细化效果最差。在本试验条件下，中间合金在冷轧变形量约为60％时，表现出最佳的晶粒细化效果。
关键词：Al-Ti-C-B；中间合金；晶粒细化；TiAl3；变形处理；TiCxBy；TiB2
毕业设计说明书（毕业论文）外文摘要
Title Effect of rolling deformation on the microstructure of
Al-Ti-C-B master alloys and its grain refining efficiency on α-Al
Abstract In the present study, a series of rolling process have been taken on the Al-5Ti-0.3C-0.2B master alloy by controlling the deformation and rolling temperature. 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 et al. Furthermore, the grain refining performance of Al-5Ti-0.3C-0.2B master alloy with different deformation process have also been carried out on commercial pure aluminum.
It is found that the plate-like TiAl3 phases in the alloy has been dramatically broken after the rolling deformation. Meanwhile, the distribution of the TiCxBy and TiB2 particles in the matrix has also been improved and become more dispersive. When the deformation increased larger than 90%, some large TiCxBy and TiB2 particles were also been broken severly.
It is also found that the grain refining performance has also been influenced to some extent by the deformation. The grain refining efficiency of the master alloy is increased at a relatively small rolling reduction ( smaller than 60%). However, the grain refining efficiency is decreased with the further increase of the deformation. Besides, the grains refined by the master alloy treated by the cold rolling is smaller than those treated at 300℃ at the same rolling reduction. The best grain refining efficiency is obtained at a cold rolling reduction of 60%.
Keywords: Al-Ti-C-B; master alloys; grain refinement; TiAl3; deformation processing; TiCxBy; TiB2
目录
第一章 绪论 1
1.1 铝合金晶粒细化意义 1
1.2 铝合金晶粒细化剂的发展及比较 1
1.3 课题的提出及意义 2
1.4 课题研究内容 3
第二章 试验方案与研究方法 4
2.1 试验材料 4
2.2 试验设备与仪器 4
2.3 技术路线 5