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木虫之王 (文坛精英)

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专业: 凝聚态物性 II ：电子结构

[交流] PNAS发表Johnson研究组最新成果-Ti基金属玻璃复合材料

http://www.pnas.org/content/early/2008/12/11/0809000106.abstract

Development of tough, low-density titanium-based bulk metallic glass matrix composites with tensile ductility
Douglas C. Hofmann1, Jin-Yoo Suh, Aaron Wiest, Mary-Laura Lind, Marios D. Demetriou, and William L. Johnson
+Author Affiliations

Keck Laboratory of Engineering Materials, California Institute of Technology, Pasadena, CA 91125
Edited by J. C. Phillips, Rutgers University, Piscataway, NJ, and approved November 11, 2008 (received for review September 10, 2008)

Abstract
The mechanical properties of bulk metallic glasses (BMGs) and their composites have been under intense investigation for many years, owing to their unique combination of high strength and elastic limit. However, because of their highly localized deformation mechanism, BMGs are typically considered to be brittle materials and are not suitable for structural applications. Recently, highly-toughened BMG composites have been created in a Zr–Ti-based system with mechanical properties comparable with high-performance crystalline alloys. In this work, we present a series of low-density, Ti-based BMG composites with combinations of high strength, tensile ductility, and excellent fracture toughness.

Footnotes
1To whom correspondence should be addressed. E-mail: dch@caltech.edu Author contributions: D.C.H. and W.L.J. designed research; D.C.H., J.-Y.S., A.W., and M.-L.L. performed research; D.C.H., J.-Y.S., M.D.D., and W.L.J. analyzed data; and D.C.H. and W.L.J. wrote the paper.
The authors declare no conflict of interest.
This article is a PNAS Direct Submission.
© 2008 by The National Academy of Sciences of the USA

http://www.sciencenet.cn/htmlpaper/20081222162611534536.html

科学家开发出新型“金属玻璃”

美国加州理工学院一个科研小组日前开发出一种以钛为基础的“金属玻璃”，这种新型材料重量轻，成本低，能保持极佳的韧性及延展性，可应用于航空航天领域。

这一研究成果发表在新一期美国《国家科学院院刊》网络版上。

这个科研小组早前曾在英国《自然》杂志上发表论文，介绍研制“金属玻璃”的一种新方法。当时他们主要以金属锆来进行合成。但以锆为基础的“金属玻璃”密度相对较大，为每立方厘米5.6克至6.4克，应用于航空航天领域仍然不够理想。

研究人员道格拉斯·霍夫曼介绍说，他们尝试以金属钛为基础材料，最终开发出密度更小的“金属玻璃”，其密度控制在每立方厘米4.5克至5克之间。与其他类型“金属玻璃”相比，新型“金属玻璃”的韧性和延展性毫不逊色。

钛比锆的价格低，因此这种新型“金属玻璃”的成本更低。（来源：新华网张忠霞）

（《国家科学院院刊》（PNAS），DOI: 10.1073/pnas.0809000106 ，Douglas C. Hofmann，William L. Johnson ）

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