期刊
CRYSTAL GROWTH & DESIGN
卷 15, 期 12, 页码 5661-5664出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.5b01167
关键词
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资金
- National Natural Science Foundation of China [51327901]
- Aviation Science Foundation of China [2014ZF53069]
- NPU Foundation for Fundamental Research [3102015ZY077]
- Singapore-MIT Alliance (SMA)
Herein, we adopted alloying and rapid-dendrite-growth methods to improve the mechanical properties of Fe-based alloys. Three molten alloys including Fe-5Ni-5Mo-5Ge, Fe-5Ni-5Mo-5Ge-SCo, and Fe-5Ni-5Mo-5Ge-5Co-5Si were undercooled, during which (alpha Fe) dendrites grew rapidly with the decrease of temperature (i.e., increase of undercooling). The rapid growth of (alpha Fe) dendrites in the Fe-5Ni-SMo-SGe-5Co alloy at a high rate of 31.8 ms(-1) caused by a large undercooling more effectively enhanced the microhardness than a Co addition did. In comparison, because of the great disparity of atom size and valence electron number between Fe and Si, a further Si addition suppressed the (aFe) dendrite growth while dramatically increasing the Vickers microhardness of the Fe-5Ni-5Mo-5Ge-5Co-5Si alloy to H-V 622.
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