Optimized compositions for bulk metallic glass (BMG) formation have been determined for the Cu-Hf binary and Cu-Hf-Al ternary systems. The Cu-Hf-Al BMG-forming composition region is identified to correlate with the (L -> Cu(10)Hf(7) + CuHf(2) + CuHfAl) eutectic reaction. The eutectic temperature is reduced by nearly 50 K relative to that of the binary eutectic, demonstrating the significant role of the third element Al in stabilizing the liquid. The fragility parameter D* of the Cu(55)Hf(45) binary and Cu(49)Hf(42)Al(9) ternary supercooled liquid was determined from relaxation time measurements, indicating that Al incorporation also leads to a "stronger" liquid. The combination of these thermodynamic and kinetic effects is responsible for the dramatic enhancement of glass-forming ability from the Cu-Hf binary to the Cu-Hf-Al ternary.
部门归属
[jia, peng; xu, jian] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;xu, j (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china;jianxu@imr.ac.cn
P. Jia,J. Xu. Comparison of bulk metallic glass formation between Cu-Hf binary and Cu-Hf-Al ternary alloys[J]. Journal of Materials Research,2009,24(1):96-106.
APA
P. Jia,&J. Xu.(2009).Comparison of bulk metallic glass formation between Cu-Hf binary and Cu-Hf-Al ternary alloys.Journal of Materials Research,24(1),96-106.
MLA
P. Jia,et al."Comparison of bulk metallic glass formation between Cu-Hf binary and Cu-Hf-Al ternary alloys".Journal of Materials Research 24.1(2009):96-106.
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