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个人信息Personal Information
教授
博士生导师
硕士生导师
主要任职：材料科学与工程学院院长、党委副书记
其他任职：辽宁省高熵合金材料工程研究中心常务副主任、大连理工大学滇西产业发展研究院先进材料制备及装备技术工程研究中心主任
性别：男
毕业院校：西北工业大学
学位：博士
所在单位：材料科学与工程学院
学科：材料加工工程. 材料学. 材料物理与化学
办公地点：辽宁省凝固控制与数字化制备技术重点实验室315室
联系方式：0411-84709400
电子邮箱：luyiping@dlut.edu.cn
Microstructure and hardness of undercooled Ni78.6Si21.4 eutectic alloy
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论文类型：期刊论文
发表时间：2010-02-04
发表刊物：JOURNAL OF ALLOYS AND COMPOUNDS
收录刊物：SCIE、EI、Scopus
卷号：490
期号：1-2
页面范围：L1-L4
ISSN号：0925-8388
关键字：Metal and alloy; Microstructure; Mechanical properties; Hardness
摘要：The maximum undercooling up to 550 K was achieved in the bulk eutectic Ni78.6Si21.4 alloy melt through glass fluxing, which was combined with cyclic superheating. Transmission electron microscope (TEM), scanning electron microscope (SEM) and optical microscopy techniques were adopted to investigate the microstructure, and identified the phase composition. The directional growth, quasi-regular and refined microcrystalline microstructures were achieved in the as-solidified structure with the increased undercooling. With the increase of undercooling, the relationship between the microstructure and the hardness including the size effect of crystal grain were systematically investigated. The experimental results show that directional growth, quasi-regular and refined microstructure produced large strengthening effect, and improved the hardness to 56.5 on the Rockwell hardness C (HRC) scale. The fact is also proved by the Vickers hardness. (c) 2009 Elsevier B.V. All rights reserved.