Collaborative Research: Ultrasound, Oxide, and Oxygen: Microscale Mechanisms for Next-generation Alloy Casting

合作研究：超声波、氧化物和氧气：下一代合金铸造的微观机制

• 批准号: 1562567
• 负责人: Antoine Allanore
• 金额: $ 14.07万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-01 至 2020-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1562567&HistoricalAwards=false
• 关键词: Collaborative; Research; Ultrasound; Oxide; Oxygen

More than 90 percent of U.S. manufactured goods contain cast metal components made with a process involving multiple steps, which include melting of the original metal, and solidification in casts. The commercial viability and energy efficiency of the entire operation require controlling and predicting product quality while maximizing the rate of casting. Unfortunately, measuring the properties of the melt during processing is difficult, and to date quality tests occur only after solidification. This award supports research aimed at providing a new tool to evaluate the melt properties using sound waves at very high frequency (ultrasound). The anticipated results are expected to enable real-time monitoring of the casting process, and lead to new processing methods that will increase the energy efficiency of casting. In metal casting, precise control of the melt properties prior to solidification can be achieved after identifying and characterizing features like grains, inclusions, and bubbles. Ultrasound metrology could track those features, while also imaging solidification fronts and measuring melt flow. Unfortunately, prior implementations of ultrasound in liquid metal have often been unreliable and intermittent. The physical mechanisms impeding ultrasound metrology are not understood. This collaborative project will couple advanced physical and chemical science to enable real-time imaging and flow measurement via ultrasound metrology, before solidification. Combining electrochemical and ultrasound techniques for melt measurements, the project will determine the microscale mechanisms of interaction among ultrasound, metal, oxide, and dissolved gas in order to enable the further development of real-time monitoring of molten metal properties.

超过90%的美国制成品包含铸造金属部件，这些部件是通过涉及多个步骤的工艺制成的，其中包括原始金属的熔化和铸件的凝固。整个操作的商业可行性和能源效率需要控制和预测产品质量，同时最大限度地提高铸造速度。不幸的是，在加工过程中测量熔体的性质是困难的，并且迄今为止质量测试仅在固化后进行。该奖项支持旨在提供一种新工具的研究，以使用非常高频率的声波（超声波）来评估熔体性能。预期的结果有望实现对铸造过程的实时监控，并带来新的加工方法，从而提高铸造的能源效率。在金属铸造中，在识别和表征晶粒、夹杂物和气泡等特征后，可以在凝固前实现对熔体性质的精确控制。超声波计量可以跟踪这些特征，同时还可以对凝固前沿进行成像并测量熔体流动。不幸的是，超声在液态金属中的现有实现通常是不可靠的和间歇的。阻碍超声计量的物理机制尚不清楚。该合作项目将结合先进的物理和化学科学，在固化前通过超声计量实现实时成像和流量测量。该项目将电化学和超声波技术结合起来用于熔体测量，将确定超声波、金属、氧化物和溶解气体之间相互作用的微观机制，以便进一步发展对熔融金属性能的实时监测。

项目成果

Analysis of the partial molar excess entropy of dilute hydrogen in liquid metals and its change at the solid-liquid transition

液态金属中稀氢的部分摩尔过剩熵及其固液转变时的变化分析

• 发表时间: 2019
• 期刊: Acta materialia
• 影响因子: 9.4
• 作者: Caldwell, Andrew J;Allanore, A.
• 通讯作者: Allanore, A.