期刊
MATERIALS RESEARCH LETTERS
卷 2, 期 4, 页码 185-191出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2014.935821
关键词
Gradient Structure; Synergetic Strengthening; Stress Gradient; Mechanical Incompatibility
资金
- 973 programs [2012CB932203, 2012CB937500, 6138504]
- National Natural Science Foundation of China [11222224, 11072243, 51301187, 50571110]
- Pangu Foundation
- US Army Research Office [W911NF-09-1-0427, W911QX-08-C-0083]
Gradient structures are characterized with a systematic change in microstructures on a macroscopic scale. Here, we report that gradient structures in engineering materials such as metals produce an intrinsic synergetic strengthening, which is much higher than the sum of separate gradient layers. This is caused by macroscopic stress gradient and the bi-axial stress generated by mechanical incompatibility between different layers. This represents a new mechanism for strengthening that exploits the principles of both mechanics and materials science. It may provide for a novel strategy for designing material structures with superior properties.
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