铝基快凝合金的粘度与弹性和热稳定的相关性研究

发布时间：2018-03-13 16:44

本文选题：平均热膨胀系数　切入点：激活能　出处：《山东农业大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文研究对象为铝基快凝合金,研究了铝基快凝合金的激活能与其平均热膨胀系数的相关性,铝基快凝合金的激活能和其液相线温度与过热液体脆性参数的相关性,以及铝基快凝合金的激活能与其剪切模量和杨氏模量的相关性。利用高温粘度仪对铝基熔体粘度进行多次测量,并取平均值。利用Origin软件并根据Arrhenius公式对测得的粘度点随温度的变化规律进行拟合获取拟合曲线以及激活能等有关参数。利用真空炉熔炼制备铝基合金,其中,在合金的熔炼过程中,为了材料的均匀性,要求对材料进行3次以上的熔炼。对制备好的铝基合金锭子,通过铜模吸铸的方法制备快凝合金。热膨胀的测量,选取内径为2 mm的铜模具,制备直径为2 mm的合金棒。而对于弹性模量的测量,则选用内部为2 mm厚的板的铜模具进行吸铸。利用热分析仪对铝基合金的液相线温度进行测量。从液体状态向固体状态转变的过程中,存在着遗传性质,对此已做了大量研究。基于液固遗传的特性,研究了快凝铝基合金的激活能和平均热膨胀系数与弹性模量的关系。基于凝固遗传特性,研究了快凝铝基合金激活能与其液相线温度之间的关系,其中,凝固在材料的制备和液态成形中起着至关重要的作用。发现激活能和液相线温度与弹性模量(杨氏模量,剪切模量)呈正相关性,和平均热膨胀系数呈负相关性。通过激活能与过热液体脆性参数的线性关系的研究,间接推出过热脆液体脆性参数和平均热膨胀系数与弹性模量的线性关系。对以上结果的分析,从原子尺度出发对其加以描述,即原子结合力越大,激活能越大,液相线温度、弹性模量(杨氏模量,剪切模量)也越大,而平均热膨胀系数则越小。
[Abstract]:The relationship between the activation energy and the average coefficient of thermal expansion of aluminum-based alloys, the relationship between the activation energy of aluminum-based alloys and their liquid phase temperature and the brittleness parameters of superheated liquids are studied in this paper. And the correlation between the activation energy and the shear modulus and Young's modulus of aluminum-based fast solidification alloy. The viscosity of Al-base melt was measured many times by high temperature viscometer. By using Origin software and Arrhenius formula, the fitting curve and activation energy were obtained by fitting the measured viscosity point with temperature. Aluminum base alloy was prepared by vacuum furnace melting, in which, In the melting process of the alloy, for the uniformity of the material, the material must be melted more than three times. For the Al-base alloy spindles prepared, the fast solidifying alloy is prepared by the method of copper mould suction and casting. The measurement of thermal expansion, A copper die with an inner diameter of 2 mm is selected to prepare the alloy rod with a diameter of 2 mm. However, for the measurement of elastic modulus, Then the copper mould with a thickness of 2 mm was selected for absorption casting. The liquid phase line temperature of the Al-base alloy was measured by thermal analyzer. During the transition from the liquid state to the solid state, there were genetic properties. Based on the characteristics of liquid-solid inheritance, the relationship between activation energy, average coefficient of thermal expansion and elastic modulus of rapidly solidified Al-base alloys has been studied. The relationship between the activation energy of rapidly solidified Al-base alloy and its liquid-phase line temperature is studied, in which solidification plays an important role in the preparation and liquid forming of the material. It is found that the activation energy, the liquid-phase temperature and the elastic modulus (Young's modulus) are the key factors in the process of solidification. Through the study of the linear relationship between activation energy and brittleness parameter of superheated liquid, the relationship between activation energy and brittleness parameter of superheated liquid is studied. The linear relationship between the brittleness parameters and the average coefficient of thermal expansion of superheated brittle liquids and the elastic modulus is derived indirectly. The above results are described from the atomic scale, that is, the larger the atomic binding force, the greater the activation energy and the temperature of the liquid phase line. The greater the elastic modulus (Young's modulus, shear modulus), and the smaller the average coefficient of thermal expansion.
【学位授予单位】：山东农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG292

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