文章信息/Info

Title:

Review of simulation research on the fundamental unit for the plastic deformation of metallic glass

作者:

呂云卓

大連交通大學

Author(s):

Lu Yunzhuo

Dalian Jiaotong University

關鍵詞:

非晶合金; 塑性形變; 基本單元; 模擬方法; 流動事件

Keywords:

metallic glass;  plastic deformation;  fundamental unit;  simulation methods;  flow event

DOI:

10.7502/j.issn.1674-3962.2017.04.06

文獻標志碼:

A

摘要:

非晶合金因其獨特的長程無序、短程有序的結構特征而呈現復雜多樣的宏觀塑性形變行為。盡管如此，目前非晶合金領域已經達成一個共識：非晶合金復雜多樣的宏觀塑性形變行為具有完全相同的微觀“元過程”，那就是一種能夠承載剪切變形的局部原子瞬時重排過程，這一瞬時重排過程通常被稱為“流動事件”。由于“流動事件”的尺寸較小，發生速度較快，現有的測試手段很難同時實現高時間和高空間的分辨率對其進行直接觀測，所以目前人們通常采用模擬的方法來對其進行研究。本文主要介紹了目前研究非晶合金“流動事件”的模擬方法，并對這些模擬方法的優勢和缺點進行了評述，最后簡要展望了非晶合金塑性形變基本單元模擬研究需要重點關注的幾個問題。

Abstract:

Due to their unique structural characteristics such as long-range disorder and short-range order, metallic glasses exhibit complex and diverse macroscopic plastic deformation behaviors. In spite of this, the field of amorphous alloy has currently reached a consensus: complex and diverse macroscopic plastic deformation behaviors of metallic glasses have the same microscopic "unit process", that is a local rearrangement of atoms undergoing inelastic shear distortion to accommodate plastic deformation, commonly referred to as "flow event". Since the size of the "flow event" is too small and its occurrence is too fast, the existing testing methods, which are difficult to achieve high time and spatial resolutions at the same time, are hard to directly observe it. So people often adopt simulation methods to carry on the research on the "flow event". In this paper, we briefly review these simulation methods and their advantages and disadvantages. Finally, we identify a number of important points that deserve further investigation in the simulation research on the fundamental unit for the plastic deformation of metallic glass.