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摘要通过室温下对轧制变形量的控制，对 Al-5Ti-0.3C 中间合金进行变形处理，观察变形量对其微观组织的影响，并探究其对中间合金细化行为的影响。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。在室温下轧制处理，当变形量低于60％时，Al-Ti-C 中间合金中的板片状 TiAl3相均发生明显地破碎断裂，但未与 TiC相发生明显分离，此时随着变形量的增加 Al-5Ti-0.3C中间合金的细化效果是提升的。同时，TiC颗粒在基体中的分布也得到一定程度地改善。但是随着变形量的增加，当变形量达60％以上，TiC与 TiAl3相两相分离，此时细化效果会减弱，但是TiC粒子更加弥散地分布于集体中抗衰退性增强。但变形量达到 90%以上，一些尺寸较大的 TiC 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， 但由于此时TiC 粒子的形态， 尺寸也有所变化， 有效形核粒子减少。 Al-5Ti-0.3C中间合金细化效果显著下降，抗衰退性也变差。25990
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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。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。
毕业论文关键词：Al-Ti-C；中间合金；晶粒细化；Ti；TiAl3；变形处理；TiC，
Title Effect of rolling deformation on the microstructure of Al-Ti-C master alloys and its grain refining efficiency onα-Al
Abstract
The Al-5Ti-0.3C intermediate alloy is deformated by the control of rolling
at room temperature deformation , observing the amount of deformation effect on
the microstructure, and explore its impact on the behavior of refined master
alloy . The changes in its microstructure is studied through a series of analysis
and testing tools, and it is analysed by refining the test for each set of samples
for grain refinement commercial aluminum furtherly .
When the deformation amount is less than 60%, the plate-like TiAl3 phases of
Al-Ti-C intermediate alloy rollied at room temperature, are observed fragmentation
fracture without TiC phase-separated.At this time with Al-5Ti-0.3C increasing ,
intermediate alloy refining effect is raising the amount of deformation and TiC
particle distribution in the matrix has also been improved. But with the increasing
in the amount of deformation, especailly when the deformation amounted to more
than 60%, TiC and TiAl3 two-phase is separatied, and then its refining effect is
weakened, but more dispersed TiC particles distributed in collective enhances
anti-recession. However, when its Al-Ti-C intermediate alloy is more than 90%
deformation, the size of some of the larger particles TiC itself appears crushing
phenomenon, greatly reducing the size of the second phase, so the distribution
is more diffused.Because of the TiC particle morphology and size , nucleation
particles is reduced. With Al-5Ti-0.3C intermediate alloy refining effect significantly reduced, its anti-recessionary also deteriorated.
Lower the amount of deformation can cause master alloy refining effect improved
to a certain extent; with the increasing amount of deformation (cold deformation
of more than 60%), the effect of grain refining master alloy gradually
deteriorated. Roll through treatment, the amount of deformation is further
increased to 99.7% when the refinement of middle alloy worst. Under the
experimental conditions, the master alloy in cold rolling about 60%, showed the
best grain refinement.
Keywords: Al-Ti-C; master alloy; grain refinement; Ti; TiAl3; deformation process;TiC,
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