Starting with Zr of two different purities, Ti-based bulk metallic glasses (BMGs) with a nominal composition of Ti40Zr25Cu12Ni3Be20 were prepared. The effect of the addition of yttrium at levels of 0.2 at.%, 0.4 at.%, 0.5 at.%, 0.6 at.%, and 1 at.% on the glass forming ability (GFA) of the alloy has been investigated by means of metallography, X-ray diffraction, and differential scanning calorimetry. Experimental data in-dicates that high impurity content dramatically reduces the glass forming ability. Microalloying with 0.5 at.% Y is effective in suppressing the crystalline phase formation and alleviating the detrimental effect of oxygen in the low-purity alloy. On the contrary, in the alloy contain-ing high-purity element, the effective yttrium addition is less than 0.4 at.%. The results indicate that the beneficial effect of the optimum dopants is mainly due to scavenging the oxygen impurity via the formation of innocuous phase.
参考文献
| [1] | Johnson W L .Bulk glass-forming metallic alloys:science and technology[J].MRS Bulletin,1999,24:42. |
| [2] | Inoue A .Stabilization of metallic supercooled liquid and bulk amorphous alloys[J].Acta Materials,2000,48:279. |
| [3] | Wang WH;Dong C;Shek CH .Bulk metallic glasses[J].Materials Science & Engineering, R. Reports: A Review Journal,2004(2/3):45-89. |
| [4] | Gebert A;Eckert J;Schultz L .Effect of oxygen on phase formation and thermal stability of slowly cooled Zr65Al7 5Cu17 5Ni10 metallic glass[J].Acta Materials,1998,46:5475. |
| [5] | Liu C T;Chisholm M F;Miller M K .Oxygen impurity and microalloying effect in a Zr-based bulk metallic glass alloy[J].Intermetallics,2002,10:1105. |
| [6] | Lu ZP;Liu CT .Role of minor alloying additions in formation of bulk metallic glasses: A review[J].Journal of Materials Science,2004(12):3965-3974. |
| [7] | Wang W H .Roles of minor additions in formation and properties of bulk metallic glasses[J].Progress in Materials Science,2007,52:540. |
| [8] | Role of yttrium in glass formation of Fe-based bulk metallic glasses[J].Applied physics letters,2003(13):2581-2583. |
| [9] | Ponnambalam V;Poon SJ;Shiflet GJ .Fe-Mn-Cr-Mo-(Y,Ln)-C-B (Ln = lanthanides) bulk metallic glasses as formable amorphous steel alloys[J].Journal of Materials Research,2004(10):3046-3052. |
| [10] | Yong Zhang;Ming Xiang Pan .Formation of Zr-Based Bulk Metallic Glasses from Low Purity of Materials by Yttrium Addition[J].Materials transactions,2000(11):1410-1414. |
| [11] | Wang W H;Bia Z N;Wen P;Zhang Y,Pan M X,Zhao D Q .Role of addition in formation and properties of Zr-based bulk metallic glasses[J].Intermetallics,2002,10:1249. |
| [12] | Xu D H;Duan G;Johnson W L .Unusual glass-forming ability of bulk amorphous alloys based on ordinary metal copper[J].Physical Review Letters,2004,92:245504. |
| [13] | Xu X;Chela L Y;Zhang G Q;Wang L N,Jiang,J Z .Formation of bulk metallic glasses in Cu45Zr48-xAl7Rex (Re=La,Ce,Nd,Gd and 0 ≤x ≤5 at %)[J].INTERMETALLICS,2007,15:1066. |
| [14] | Tao Zhang;Akihisa Inoue .Thermal and mechanical properties of Ti-Ni-Cu-Sn amorphous alloys with a wide supercooled liquid region before crystallization[J].Materials transactions,1998(10):1001-1006. |
| [15] | Kim Y C;Kim W T;Kim D H .A development of Ti-based bulk metallic glass[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2004,375:127. |
| [16] | Guo F;Wang H J;Pooh S J;Shiflet G J .Ductil titanium-based glassy alloy ingots[J].Applied Physics Letters,2005,86:091907. |
| [17] | X. H. Lin;W. L. Johnson;W. K. Rhim .Effect of Oxygen Impurity on Crystallization of an Undercooled Bulk Glass Forming Zr-Ti-Cu-Ni-Al Alloy[J].Materials transactions,1997(5):473-477. |
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