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壓力對La-Al-(Cu,Ni)金屬玻璃結(jié)構(gòu)馳豫的影響
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Pressure Effects on Structural Relaxation of La-Al-(Cu, Ni) Bulk Metallic Glass
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Project supported by the Hunan Science Foundation Grant (05JJ30110)

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    摘要:

    采用銅模吸鑄法制備出La62.0Al15.7(Cu0.5Ni0.5)22.3大塊金屬玻璃，經(jīng)高壓處理后，用X射線衍射儀(XRD)和示差掃描量熱計(DSC)對非晶的結(jié)構(gòu)馳豫和晶化過程進行了研究。結(jié)果表明，非晶玻璃轉(zhuǎn)變溫度和第一晶化溫度隨著壓力的增加，其先增加后減小，極大值出現(xiàn)在4.0 GPa的壓力。這種現(xiàn)象歸因于經(jīng)過高壓處理后玻璃轉(zhuǎn)變溫度區(qū)焓的變化，而焓的變化由基體缺陷激活體積引起自由體積變化所導(dǎo)致。此外，高壓處理還影響玻璃的結(jié)晶過程。

    Abstract:

    In this study, La62.0Al15.7(Cu0.5Ni0.5)22.3 bulk 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 diffraction (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 free 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.

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王鋒華,林建國,翟甲友,羅 聯(lián),任國仲.壓力對La-Al-(Cu, Ni)金屬玻璃結(jié)構(gòu)馳豫的影響[J].稀有金屬材料與工程,2009,38(6):958~961.[Wang Fenghua, Lin Jianguo, Zhai Jiayou, Luo Lian, Ren Guozhong. Pressure Effects on Structural Relaxation of La-Al-(Cu, Ni) Bulk Metallic Glass[J]. Rare Metal Materials and Engineering,2009,38(6):958~961.]
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  • 收稿日期:2008-06-25
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