摘要 当下，国内国外科部门展开的研究工作内容，主要在半固态浆料制备和半固态材料成形这几个部分，不过大多技术并不成熟，应用在工业的不多。

这次实验经过制做高品质的流变压合金铸件，研究了半固态铝合金结构在不同工艺参数下的影响，并且进行了实验分析。 在铝合金合金机械搅拌原理基本下，研究了工艺参数对半固态铝合金组织的影响情况。半固态浆料制备过程中晶粒变化的情况，探索讨论了强制对流条件下的晶粒长大情况，本次研究内容主要如下：87932

我们将铝合金投入，温度预热400℃熔化炉中，然后对此升温至700℃后将其融化，一般控制合金液降温630-680℃之间，并且调整筒体的温度在570-600℃之间，同样调整 螺杆的转速在100-400 r/min之间，然后将熔融合金液浇入到FCR设备里，搅拌(30 s)后，将制备出半浆料注入到特制的不锈钢锅中，并且迅速放入水中快速冷却。这样做主要是便于我们更准确地观察浆料的组织形貌特点。

最后沿坯料轴线方向的中间部分截取12 mm厚度，并且制取扇形大小作为金相试样。试样通过砂纸打磨，机械抛光处理后，直接用Barker试剂阳极覆膜，电压控制在20v左右，时间一般为2-3min。并用光学显微镜对组织进行观察分析情况，从而对比不同的工艺参数制备出的A356铝合金半固态浆料状态。From~优Y尔R论^文W网wWw.YoUeRw.com 加QQ7520.18766

相同条件对比下，一定搅拌速率的提高，会使合金液降温更快，颗粒更均匀，半固态合金在稍高搅拌速率下的性能将显着好于未搅拌且缓慢搅拌。

水冷条件下，适度的提高搅拌时间，合金液熔体中温度会变得更均匀，颗粒会更圆整，搅拌时间从10 s-30 s，晶粒粒减小圆整度提高。

毕业论文关键词：半固态;晶粒;铝合金;影响；半固态组织

  Abstract At present, the contents of the research work carried out by the domestic and foreign surgical departments mainly focus on semi-solid slurry preparation and semi-solid material forming。 However, most of the technologies are not mature and are not used in industries。

In this paper, through the preparation of high quality aluminum alloy rheo-diecasting parts, the influence of semi-solid aluminum alloy structure under different process parameters, experiments and analysis。 Based on the principle of mechanical agitation, the effect of technological parameters on the microstructure evolution of the semi-solid aluminum alloy was studied。 The variation of grain size during the semi-solid slurry preparation was analyzed and discussed。 The grain length under forced convection Big situation, the main contents of this study are as follows:

We put the aluminum alloy, the temperature preheated 400 degrees melting furnace, and then the temperature was raised to 700 degrees after melting, the general control of alloy liquid cooling 630-680 degrees, and adjust the cylinder temperature of 570-600 degrees Between the same adjustment screw speed 100-400 r / min, and then molten alloy liquid into the FCR equipment, stirring (30 seconds), the prepared slurry was injected into a special stainless steel pot , And quickly into the water for rapid cooling。 This is done primarily to allow us to more accurately observe the histological features of the slurry。

Finally, a thickness of 12 mm was taken along the middle part of the billet in the direction of the axis of the billet, and a fan-shaped size was taken as the metallographic sample。 The sample is sandpaper polished, mechanically polished, directly coated with Barker reagent anode, the voltage is controlled at about 20v, the time is generally 1-2min。 The microstructure of the A356 aluminum alloy semi-solid slurry prepared by different process parameters was compared with the optical microscope。