采用铜模吸铸法制备出La62.0Al15.7(Cu0.5Ni0.5)22.3大块金属玻璃,经高压处理后,用X射线衍射仪(XRD)和示差扫描量热计(DSC)对非晶的结构驰豫和晶化过程进行了研究.结果表明,非晶玻璃转变温度和第一晶化温度随着压力的增加,其先增加后减小,极大值出现在4.0 GPa的压力.这种现象归因于经过高压处理后玻璃转变温度区焓的变化,而焓的变化由基体缺陷激活体积引起自由体积变化所导致.此外,高压处理还影响玻璃的结晶过程.
s In this study, La62.0Al15.7(Cu0.5Ni0.5)22.3bulk metallic glasses (BMGs) were prepared by copper mold casting method, and the effects of the pressure treatment up to 5.0 GPa at room temperature on structural relaxation were investigated by X-ray diffrac-tion (XRD) and differential scanning calorimeter (DSC). The results showed that structural relaxation occurred with changes of the glass transition temperature (Tg) and the onset of primary crystallization (Tx1). Both increased with increasing of applied pressure up to 4.0 GPa beyond which they decreased. The enthalpy changed at the glass transition temperature regime showed that the reduction of the flee volume caused by the HP treatment can be interpreted by the activation volumes of the flow defects. Furthermore, the HP treatment also influenced the crystallization sequence of the BMG.
参考文献
| [1] | Inoue A;Zhang T;Masumoto T .[J].Materials Transactions-Japan Institute of Metals,1991,31:425. |
| [2] | 吴学庆,马蓦,檀朝桂,刘学斌,林建国.Al88Ni6La6非晶及其晶化薄带的腐蚀行为研究[J].稀有金属材料与工程,2007(09):1668-1671. |
| [3] | Wang W H .[J].Progress Material Science,2007,52:540. |
| [4] | 喻更生,李伏,魏炳忱,马蓦,林建国.Nd60Al10Fe20Co10金属玻璃的变形行为[J].稀有金属材料与工程,2005(03):371-374. |
| [5] | Wang X F et al.[J].Materials Letters,2007,61:1715. |
| [6] | Pan MX.;Yao YS.;Zhao DQ.;Zhuang YX.;Wang WH. .Pressure-controlled nucleation and growth in Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass close to and beyond glass transition temperature[J].Physics Letters, A,2002(2/3):229-234. |
| [7] | Li H Q et al.[J].Journal of Alloys and Compounds,2007,428:185. |
| [8] | Xing P F et al.[J].Journal of Applied Physics,2002,91:4956. |
| [9] | Pan M X et al.[J].Applied Physics Letters,2001,78:601. |
| [10] | Yu P et al.[J].Applied Physics Letters,2007,90:051906. |
| [11] | van den Beukel;Seitsma A .[J].Acta Materialia,1990,38:383. |
| [12] | Murali P;Ramamurty U .[J].ACTA MATERIALIA,2005,53:1467. |
| [13] | Yu G S et al.[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2007,460-461:158. |
| [14] | Wen P et al.[J].Physical Review B,2004,68:092 201. |
| [15] | Jin H J et al.[J].Acta Materialia,2003,51:6219. |
| [16] | Jiang Q K et al.[J].Acta Materialia,2007,55:4409. |
| [17] | Jin H et al.[J].ACTA MATERIALIA,2005,53:3013. |
| [18] | Shen Z Y et al.[J].Physical Review B,1989,89:2714. |
| [19] | Zhang HW;Zhou TJ .Pressure effect on the crystallization behavior of Zr46.7Ti8.3Cu7.5Ni10Be27.5 bulk metallic glass[J].Physics Letters, A,2006(3/4):297-301. |
| [20] | Akihiko Hirata;Yoshihiko Hirotsu;Tadakatsu Ohkubo .Local atomic structure of Pd-Ni-P bulk metallic glass examined by high-resolution electron microscopy and electron diffraction[J].Intermetallics,2006(8/9):903-907. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%