报告题目:Influence of Microstructural Length Scale on Microstructure and Mechanical Behavior of High Entropy Alloys
报 告 人:付志强 博士, 加州大学尔湾分校
报告时间:2016年11月15日(星期二)下午15:00-16:30
报告地点:机械与汽车工程学院19号楼209会议室
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机械与汽车工程学院
2016年11月14日
报告人简介:
付志强博士,主要从事纳米晶/超细晶金属材料、高熵合金及其复合材料的成形、制备与表征研究。2008年在哈尔滨工业大学获材料成型及控制工程学士学位,2011 年在哈尔滨工业大学获材料加工工程硕士学位,2015年在华南理工大学获得博士学位。2014年8月至2015年8月在美国加州大学戴维斯分校联合培养,2015年8月至2016年4月以初级专家研究员身份在美国加州大学戴维斯分校工作,2016年4月至今以博士后研究员身份在美国加州大学尔湾分校工作。留美期间,一直师从金属材料加工领域国际著名学者Enrique J. Lavernia院士。 先后在金属材料加工领域Acta Materialia、Materials Science & Engineering A等国际知名主流期刊发表SCI论文17篇,其中第一作者/通讯作者论文14篇。论文总引用次数201(Google Scholar),h-index为9 。
报告摘要:
High-entropy alloys (HEAs) demonstrate unique microstructures and mechanical properties that have attracted considerable scientific and technological interest. The objective of this talk is to report on a study of the influence of severe plastic deformation (SPD) techniques on microstructural evolution in HEAs, paying specific attention to microstructural features at multiple length scales, from micro- to nano-. As such, coarse-grained and nanostructured non-equiatomic AlFeCoNiCu HEA were prepared by casting and the combination of mechanical alloying (MA) and spark plasma sintering (SPS), respectively. Additionally, nanostructured AlCuCoCrFeNi HEA powders was first synthesized by cryomilling of gas-atomized powder, and subsequent consolidation by spark plasma sintering (SPS). The SPS sintered AlCuCoCrFeNi materials were then compared to an ultra-fine grained (UFG) HEA that was processed by high pressure torsion (HPT) from a cast AlCuCoCrFeNi HEA. The influence of the multiple length-scales is discussed to provide insight into the reported unique and fundamental phenomena associated with HEAs, i.e., chemistry/microstructural homogeneity, grain structure, diffusion, lattice distortion, thermal stability, and mechanical properties of multi-scaled HEA alloys.