Mg80Cu15Y5合金的非晶形成能力及晶化行为
Amorphous-forming Ability and Crystallization Behavior of Mg80Cu15Y5 Alloy
宁向梅1,2, 黄金亮1, 殷 镖1, 张兴渊1
点击：3788次 下载：0次
作者单位：1. 河南科技大学 材料科学与工程学院, 河南 洛阳 471003; 2. 河南省有色金属材料科学与加工技术重点实验室, 河南 洛阳 471003)
中文关键字：Mg80Cu15Y5； 非晶态合金； 非晶形成能力； 晶化； 组织与性能
英文关键字：Mg80Cu15Y5; amorphous alloy; amorphous-forming ability; crystallization; microstructure and mechanical property
中文摘要：采用单辊快速凝固法制备出厚约40 μm的Mg80Cu15Y5非晶合金薄带，利用XRD、DSC、TEM和HRTEM研究了非晶合金的非晶形成能力和晶化行为，分析了晶化对合金组织结构与性能的影响。结果表明：Mg80Cu15Y5合金的过冷液态温度区间ΔTx和约化玻璃转变温度Trg分别为55 K 和0.58，表明其具有较强的非晶形成能力；该合金在退火温度高于473 K后发生明显晶化，从非晶基体中析出Mg2Cu、Cu2Y和Mg晶体相；随着退火温度的升高，合金的硬度呈现出先升高后降低的变化趋势，这与纳米晶体相颗粒的弥散析出、重溶及粗化有关。
英文摘要：Mg80Cu15Y5 amorphous alloy ribbons with the thickness of approximately 40 μm were prepared by single-roll rapid solidification method. The amorphous-forming ability and crystallization behavior were studied using XRD, DSC, TEM and HRTEM. The effects of crystallization on microstructure and mechanical property of the alloy were analyzed. The results show Mg80Cu15Y5 alloy has better amorphous-forming ability, the undercooled liquid region ΔTx is 55 K and the reduced glass-transition temperature Trg is 0.58. The remarkable crystallization of the alloy occurs after annealing above 473 K. Mg2Cu, Cu2Y and Mg crystalline phases are precipitated from the amorphous matrix. With the increase of annealing temperature, the microhardness of the alloy increases first and then decreases. The change in the microhardness of the alloy depends on the precipitation, re-melting and coarsening of the nano-crystalline particles.