文章信息/Info

Title:

 Alloy design of ultrahigh strength Co-based bulk metallic glasses

作者:

王菊; 李然; 張濤

北京航空航天大學

Author(s):

Ju WANG;  Ran LI;  Tao ZHANG

Beihang University, Beijing 100191, China

關鍵詞:

鈷基塊體非晶合金; 力學性能; 楊氏模量; 維氏硬度; 玻璃轉變溫度

DOI:

10.7502/j.issn.1674-3962.2014.06.07

文獻標志碼:

A

摘要:

塊體非晶合金是一類具有高強度、高硬度和大彈性極限的無序金屬材料，其優異的力學性能是目前先進金屬材料領域研究熱點之一。如何提高材料的強度是材料研究領域永恒的主題，本文系統地總結了已知具有超高強度的一類塊體非晶合金材料——鈷基塊體非晶合金的成分、熱學穩定性及力學性能；同時研究了不同非晶合金的斷裂強度與其彈性常數、硬度和特征溫度的關聯。研究結果表明：在非晶合金體系中楊氏模量、維氏硬度、玻璃轉變溫度與斷裂強度之間都存在較好的線性變化關系。基于以上結果，我們提出了超高強鈷基非晶合金的組成設計方法，即采用具有強共價鍵特性的非金屬元素和高模量、高熔點過渡金屬元素元素與鈷元素進行組合。

Abstract:

Bulk metallic glasses (BMGs) are a kind of disorder metal materials with high strength, high hardness and large elastic limit. The development of these materials is one of the most attractive topics for advanced metal materials. How to improve the strength of materials is an eternal topic for material scientists. In this paper, we summarized alloy compositions, thermal stability and mechanical properties of typical Co-based BMGs as the best candidates to design ultrahigh strength BMGs due to their excellent mechanical properties. Possible relationships between the mechanical properties and other physical parameters, like elastic moduli, hardness and characteristic temperature in various kinds of BMG systems are investigated. The Young’s modulus, the Vickers hardness or the glass transition temperature shows a linear dependence on the fracture strength. According to the above results, the design method of element constitution for the ultra-strong Co-based BMGs was presented. The metalloid element(s) with the characteristics of strong covalent bond and the transition metal element(s) with high elastic moduli and high melting temperature should be adopted to be great beneficial for the development of ultrahigh strength Co-based BMGs.