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采用单辊快速凝固法制备了Mg80Cu10Y10合金薄带,并对合金薄带进行热处理,利用XRD、DSC和HRTEM分析研究了该合金薄带的晶化过程及其晶化后的微观结构。结果表明:快速凝固Mg80Cu10Y10合金薄带为单一的非晶态结构,其约化玻璃转变温度Trg为0.62,具有较强的非晶形成能力;非晶合金具有三阶段晶化行为;在热处理温度为423 K时合金仍为非晶态;当温度达到473 K时,合金发生明显晶化,在非晶基体上弥散析出Mg2Cu、Cu2Y和hcp-Mg纳米晶粒;随着温度由523 K升高至623 K时,析出晶粒尺寸增大、数目减少,合金中的晶体相为hcp-Mg、Mg2Cu和Mg24Y5。
The single-roll rapid solidification method was used to prepare the Mg80Cu10Y10 alloy ribbons. The alloy ribbons were heat-treated. The crystallization process and microstructure of the ribbons were studied by XRD, DSC and HRTEM. The results show that the rapidly solidified Mg80Cu10Y10 alloy ribbon has a single amorphous structure with a reduced glass transition temperature (Trg) of 0.62 and a strong amorphous formation ability. The amorphous alloy has a three-stage crystallization behavior. When the heat treatment temperature is 423 K, the alloy is still amorphous. When the temperature reaches 473 K, the alloy crystallizes obviously and Mg2 Cu, Cu2 Y and hcp-Mg nanocrystallites are precipitated on the amorphous matrix. With the temperature rising from 523 K to At 623 K, the precipitated grain size increases and the number decreases. The crystal phases in the alloy are hcp-Mg, Mg2Cu and Mg24Y5.