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銅基大塊非晶合金的臨界冷速與組織形貌變化
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TG146.4

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Critical Cooling Rate and Microstructure Evolution of Cu-Based Bulk Amorphous Alloy
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    摘要:

    制備了具有良好玻璃形成能力的Cu52.5Ti30Zr11.5Ni6大塊非晶合金,其臨界直徑達(dá)到5mm,臨界冷卻速率約為126.8K/s。采用Jackson-Hunt公式計算了晶化組織形成的冷卻速率。當(dāng)冷卻速率在10K/s-120K/s時,晶化組織則出現(xiàn)亞穩(wěn)初生相與共晶共存的形態(tài)。當(dāng)冷卻速率低于10K/s時,亞穩(wěn)初生相的析出將被逐漸抑制,使得共晶生長方式發(fā)生改變。

    Abstract:

    Bulk amorphous Cu52.5Ti30Zr11.5Ni6(at.%) alloys up to 5 mm in diameter were fabricated by a copper mold casting method.The critical cooling rate was determined to be 126.8 K/s by using the Barandiaran-Colmenero expression.Based upon the Jackson-Hunt relation,the cooling rate for the formation of devitrified structure was also evaluated.In the cooling range of 10 K/s ~ 120 K/s,there exists a mixed microstructure of primary metastable phase and eutectic structure.With further decreasing of cooling rate(below 10K/s),the precipitation of metastable phase was depressed,and the growth mode also deviates from the eutectic mode.

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楊英俊 邢大偉 孫劍飛 魏思東 沈軍.銅基大塊非晶合金的臨界冷速與組織形貌變化[J].稀有金屬材料與工程,2007,36(2):236~240.[Yang Yingjun, Xing Dawei, Sun Jianfei, Wei Sidong, Shen Jun. Critical Cooling Rate and Microstructure Evolution of Cu-Based Bulk Amorphous Alloy[J]. Rare Metal Materials and Engineering,2007,36(2):236~240.]
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  • 最后修改日期:2005-12-06
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