本文選題：平均熱膨脹系數(shù)　切入點：激活能　出處：《山東農業(yè)大學》2017年碩士論文　論文類型：學位論文

【摘要】：本文研究對象為鋁基快凝合金,研究了鋁基快凝合金的激活能與其平均熱膨脹系數(shù)的相關性,鋁基快凝合金的激活能和其液相線溫度與過熱液體脆性參數(shù)的相關性,以及鋁基快凝合金的激活能與其剪切模量和楊氏模量的相關性。利用高溫粘度儀對鋁基熔體粘度進行多次測量,并取平均值。利用Origin軟件并根據(jù)Arrhenius公式對測得的粘度點隨溫度的變化規(guī)律進行擬合獲取擬合曲線以及激活能等有關參數(shù)。利用真空爐熔煉制備鋁基合金,其中,在合金的熔煉過程中,為了材料的均勻性,要求對材料進行3次以上的熔煉。對制備好的鋁基合金錠子,通過銅模吸鑄的方法制備快凝合金。熱膨脹的測量,選取內徑為2 mm的銅模具,制備直徑為2 mm的合金棒。而對于彈性模量的測量,則選用內部為2 mm厚的板的銅模具進行吸鑄。利用熱分析儀對鋁基合金的液相線溫度進行測量。從液體狀態(tài)向固體狀態(tài)轉變的過程中,存在著遺傳性質,對此已做了大量研究。基于液固遺傳的特性,研究了快凝鋁基合金的激活能和平均熱膨脹系數(shù)與彈性模量的關系。基于凝固遺傳特性,研究了快凝鋁基合金激活能與其液相線溫度之間的關系,其中,凝固在材料的制備和液態(tài)成形中起著至關重要的作用。發(fā)現(xiàn)激活能和液相線溫度與彈性模量(楊氏模量,剪切模量)呈正相關性,和平均熱膨脹系數(shù)呈負相關性。通過激活能與過熱液體脆性參數(shù)的線性關系的研究,間接推出過熱脆液體脆性參數(shù)和平均熱膨脹系數(shù)與彈性模量的線性關系。對以上結果的分析,從原子尺度出發(fā)對其加以描述,即原子結合力越大,激活能越大,液相線溫度、彈性模量(楊氏模量,剪切模量)也越大,而平均熱膨脹系數(shù)則越小。
[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.
【學位授予單位】：山東農業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG292

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