Presidential Young Investigator Award: Processing Structure, and Properties of Amorphous Metal Composites

总统青年研究员奖：非晶金属复合材料的加工结构和性能

• 批准号: 8657038
• 负责人: Paul Funkenbusch
• 金额: $ 22.84万
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-01 至 1993-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8657038&HistoricalAwards=false
• 关键词: Presidential; Young; Investigator; Award; Processing

This project deals with the interrelationships among fabrication, microstructure, and properties in two phase alloys. Within this broad category, several areas of interest include: 1) The effects of alloy deformation on second phase particles: specifically, how factors such as particle size, shape and volume fraction effect the rotation, fracture, and plastic deformation of particles. Practical applications of this research would include improved modeling of fracture toughness in dispersoid or inclusion containing alloys, fabrication of ultra-fine heavily deformed in situ composites, and enhancement of fiber alignment in discontinuous fiber composites by deformation processing. 2) Gradient layers: Sharp interfaces in coated or composite materials may be eliminated and thermal/mechanical stability enhanced by inserting gradient layers whose composition gradually varies between that of the two components. However, at present neither the theoretical nor practical effects of such gradients is well understood, nor has the effect of the gradient's thickness, average composition, or "compositional slope" has been characterized. 3) Microstructural effects on crack closure: In the near threshold region, crack growth may be retarded by microstructurally dependent effects. The role of second phase particles in promoting roughness of the crack surface and/or mode II cracking. 4) Amorphous metals: Effects of second phase interfaces on the behavior of metallic glasses.

本项目研究两相合金的制造、微观结构和性能之间的相互关系。在这个广泛的类别中，几个感兴趣的领域包括：1)合金变形对第二相颗粒的影响：具体而言，诸如粒度、形状和体积分数等因素如何影响颗粒的旋转、断裂和塑性变形。本研究的实际应用将包括改进含弥散体或夹杂体合金的断裂韧性建模，制造超细重变形原位复合材料，以及通过变形处理增强不连续纤维复合材料中的纤维取向。2)梯度层：通过插入梯度层，可以消除涂层或复合材料中的尖锐界面，提高热/机械稳定性，梯度层的成分在两种组分之间逐渐变化。然而，目前对这种梯度的理论和实际影响都没有很好的了解，梯度的厚度、平均成分或“成分斜率”的影响也没有被表征。3)微结构对裂纹闭合的影响：在近阈值区域，微结构依赖效应可能会阻碍裂纹扩展。第二相颗粒在提高裂纹表面粗糙度和/或II型裂纹中的作用。非晶金属：第二相界面对金属玻璃行为的影响。