Ce-Ga-Cu系非晶合金焓恢复、脆性及其玻璃形成能力的研究

发布时间：2017-12-28 09:15

本文关键词：Ce-Ga-Cu系非晶合金焓恢复、脆性及其玻璃形成能力的研究　出处：《合肥工业大学》2016年硕士论文　论文类型：学位论文

【摘要】：本文的内容涉及到Ce-Ga-Cu系非晶合金的焓恢复、脆性和玻璃形成能力等三个方面的性质,主要使用差示扫描热量仪(DSC)进行测量。焓恢复在本质上和玻璃转变有很紧密的联系,有助于更好的理解玻璃转变过程,是非晶态物理中的一个基本问题。本文通过对Ce-Ga-Cu系非晶合金的异常吸热峰进行实验,对焓恢复现象进行了探究。液体的脆性在玻璃转变过程、结构弛豫现象、玻璃形成能力等方向的研究中都有重要的意义。本文利用VFT拟合和热容的测定,获得Ce-Ga-Cu系非晶合金的动力学脆性和热力学脆性,从而分析出热力学脆性和动力学脆性之间的相互关系。而玻璃形成能力是非晶合金应用和发展都需要解决的根本性课题,本文从定性和定量两个方面来分析各项参数与玻璃形成能力的关系。在定性方面发现不是所有的参数和玻璃形成能力都有很好的对应关系,因此,在定量方面选用包含多参数的方程,但是已由Oleg N. Senkov和王利民等提出的方程不适用于Ce-Ga-Cu系非晶合金。本文提出了新的方程可以更好的拟合包括Ce基非晶合金在内的12种玻璃形成体系的临界冷却速率和m、ΔSm,和γ三个参数之间关系。研究结果可以帮助我们更好的理解影响玻璃形成能力的本质以及各项因素对玻璃形成能力的不同作用。
[Abstract]:The content of this paper is about the three aspects of Ce-Ga-Cu system amorphous alloy, such as enthalpy recovery, brittleness and glass forming ability. It is mainly measured by differential scanning calorimeter (DSC). The enthalpy recovery is closely related to the glass transition in essence, and helps to better understand the process of glass transition. It is a basic problem in amorphous physics. In this paper, the abnormal heat absorption peak of Ce-Ga-Cu amorphous alloy was tested, and the enthalpy recovery was explored. The brittleness of liquid is of great significance in the study of glass transition, structural relaxation, and glass forming ability. In this paper, the brittleness and thermodynamic brittleness of Ce-Ga-Cu based amorphous alloys are obtained by VFT fitting and heat capacity measurement, and the relationship between thermodynamic brittleness and dynamic brittleness is analyzed. The glass forming ability is a fundamental problem to be solved in the application and development of amorphous alloys. This paper analyzes the relationship between various parameters and glass forming ability from two aspects of qualitative and quantitative analysis. In qualitative aspect, it is found that not all parameters have good correspondence with glass forming ability. Therefore, the equation containing multiple parameters is selected quantitatively. However, the equation proposed by Oleg N. Senkov and Wang Limin is not suitable for Ce-Ga-Cu amorphous alloys. In this paper, a new equation is proposed, which can better match the critical cooling rate of 12 glass forming systems including Ce based amorphous alloy and the three parameters of M, Delta Sm and gamma. The results can help us better understand the nature of the influence of glass forming ability and the different effects of various factors on the ability of glass formation.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG139.8

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