文章信息/Info

Title:

 Advances in Plasticity theory for Amorphous Alloys

作者:

蔣敏強

中國科學院力學研究所 非線性力學國家重點實驗室，北京，100190

Author(s):

 JIANG Minqiang

State Key Laboratory of Nonlinear Mechanics, Chinese Academy of Sciences, Beijing 100190, China

關鍵詞:

非晶合金; 塑性流動; 塑性理論; 流動局部化

DOI:

10.7502/j.issn.1674-3962.2014.05.01

文獻標志碼:

A

摘要:

非晶合金是一類兼具玻璃和金屬雙重特性的新型材料，已經在國防、空天等領域顯示出廣闊的應用前景。非晶合金內部原子排列長程無序，沒有位錯、晶界等傳統意義上的晶體缺陷。因此，基于位錯、孿生等機制的經典塑性理論在描述這類材料的塑性行為時遇到了極大的挑戰。本文主要介紹了目前幾種代表性的非晶塑性流動理論：自由體積理論、剪切轉變理論、剪切轉變區理論以及協同剪切模型，并對非晶塑性流動局部化剪切帶機理進行了評述，最后簡要展望了非晶塑性機理發展的幾個問題。

Abstract:

 Amorphous alloys represent a class of new materials with both glassy structure and atomic bonding, showing widely potential applications in fields of defense and aerospace projects. Atomic packing is long-range disordered in amorphous alloy, without traditional crystalline defects such as dislocations and grain boundaries. Therefore, the classical theory of plasticity based on dislocations and twins poses a great challenge to describe the plasticity of amorphous alloys. In this paper, we briefly review several representative theories for amorphous plasticity including free volume theory, shear transformation theory, shear transformation zone theory and cooperative shear model. In addition, our recent advances in understanding the plastic flow localization into shear-bands are reviewed. Finally, we identify a number of important points that deserve further investigation in this field.
Keywords: amorphous alloy; plastic flow; plasticity theory; flow localization