用磁控溅射技术制备了Cu-Ta合金非晶薄膜, 并采用扫描电子显微镜研究了压应力导致非晶薄膜表面形变和纳米晶化现象.结果表明: 在纳米压头的作用下, 非晶薄膜表面压痕的锯齿流边沿处形成了纳米级颗粒(纳米晶化)结构, 且压痕外沿的颗粒尺寸大于内沿的颗粒尺寸.导致上述微观结构变化的主要原因可能是非晶自由体积流变膨胀过程中, 压头的压应力使材料内部自由体积发生移动, 在非晶基体中汇集成一些空位或气团, 纳米晶粒在这些空位或气团处形核并长大;当气团积累到一定体积发生爆裂, 导致屈服变形, 纳米晶粒被挤到压痕锯齿流的前沿.
参考文献
| [1] | Chen H;He Y;Shiflet G J et al.Deformation-induced nanocrystal formation in sheas bands of amorphous-alloys[J].Nature,1994,367:541. |
| [2] | Schuh C A;Nieh T G .A nanoindentation study of serrated flow in bulk metallic glasses[J].Acta Materialia,2002,51:87. |
| [3] | He Y;Shiflet G J;Qoon S J .Ball milling-induced nanocrystal formation in aluminum-based metallic glasses[J].Acta Metallurgica Et Materialia,1995,43:83. |
| [4] | Lu K .Nanocrystalline metals crystallized from amorphous solids: Nanocrystallization, structure, and properties[J].Materials Science and Engineering R:Reports,1996,16:161. |
| [5] | Zhang Z F;Eckert J;Schultz L .Difference in compressive and tensile fracture mechanisms of Zr59Cu20Al10Ni8Ti3 bulk metallic glass[J].Acta Materialia,2003,51:1167. |
| [6] | Weihs T P;Barbee T W;Ma W .Hardness, ductility, and thermal processing of Cu/Zr and Cu/Cu/Zr nanoscale multilayer foils[J].Acta Materialia,1997,45:2307. |
| [7] | Nieh T G;Wadsworth J .High strength freestanding metal-amorphous multilayers[J].Scripta Materialia,2001,44:1825. |
| [8] | Van Heerden D;Foecke T;Weihs TP;Gavens AJ .Evaluation of vapor deposited Nb/Nb sub 5 Si sub 3 microlaminates[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1999(1/2):212-216. |
| [9] | Kim J J;Choi Y;Suresh S et al.Nanocrystallization during nanoindentation of a bulk amorphous metal alloy at room temperature[J].Science,2002,295:654. |
| [10] | Jiang W H;Pinkerton F E;Atzmon M .Deformation-induced nanocrystallization in an Al-based amorphous alloy at a subambient temperature[J].Scripta Materialia,2003,48:1195. |
| [11] | Gao M C;Hackenberg R E;Shiflet G J .Deformation-induced nanocrystal precipitation in Al-base metallic glasses[J].Materials Transactions,2001,42:1741. |
| [12] | Effect of strain rate on the formation of nanocrystallites in an Al-based amorphous alloy during nanoindentation[J].Journal of Applied Physics,2003(11):9287-9290. |
| [13] | Zeng F;Ding M;Zhao B et al.Amorphous alloy film formed in an immiscible Cu-Ta system by ion beam assisted de[J].Materials Letters,2002,53:40. |
| [14] | Gong H R;Kong L T;Lai W S et al.Glass-forming ability determined by an n-body potential in a highly immiscible Cu-W system through molecular dynamics simulations[J].Physical Review B,2002,66:104204. |
| [15] | Lee H J;Kwon K W;Ryu C et al.Thermal stability of a Cu/Ta multilayer: An intriguing interfacial reaction[J].Acta Materialia,1999,47:396. |
| [16] | Liu B X;Lai W S;Zhang Q .Irradiation induced amorphization in metallic multilayers and calculation of glass-forming ability from atomistic potential in binary metal systems[J].Materials Science and Engineering R:Reports,2001,29:1. |
| [17] | Kwon K W;Lee H J;Sinclair R .Solid-state amorphization at tetragonal-Ta/Cu interfaces[J].Applied Physics Letters,1999,75:935. |
| [18] | Asami K;Moriya T;Hashimoto K et al.Roles of temperature and humidity in the oxidation of sputter-deposited Cu-Ta alloys in air[J].Corrosion Science,2002,44:331. |
| [19] | Mizutani U;Lee C H .Mechanical alloying in cu-v and cu-ta systems characterized by positive heat of mixing[J].Materials Transactions,1995,36:210. |
| [20] | Schuh C A;Nieh T G .A nanoindentation study of serrated flow in bulk metallic glasses[J].Acta Materialia,2003,51:87. |
| [21] | Vaidyanathan R;Dao M;Ravichandran G et al.Study of mechanical deformation in bulk metallic glass through instrumented indentation[J].Acta Materialia,2001,49:3781. |
| [22] | De Boer F R;Boom R;Matters W C M.Cohesion in Metals: Transition Metal Alloy[M].Amaterdam: North-Holland Puli.Co,1989 |
| [23] | Ogura A;Tarumi R;Shimojo M et al.Control of nanocrystalline orientation using the application of a stress field in an amorphous alloy[J].Applied Physics Letters,2001,79:1042. |
| [24] | Fischer-Cripps A C .Significance of a local temperature rise in nanoindentation testing[J].Journal of Materials Science,2004,39:5849. |
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