SGER: Laser Hardening of Aluminum Alloys

SGER：铝合金激光硬化

• 批准号: 0002086
• 负责人: Susil Putatunda
• 金额: $ 8万
• 依托单位: Wayne State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-05-01 至 2002-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0002086&HistoricalAwards=false
• 关键词: SGER; Laser; Hardening; Aluminum; Alloys

This Small Grant for Exploratory Research will establish the feasibility of performing controlled surface hardening of aluminum and its alloys with a novel excimer laser process. Aluminum Alloy 319 is widely used in industrial applications, but does not have the hardness necessary for many wear resistant applications. This alloy cannot be hardened by conventional means. This project will investigate the potential for creating an aluminum nitride surface layer by highly controlled energy input to the surface which is exposed to a nitrogen environment. There are several metallurgical issues that make this a high risk endeavor. Early work in thermal laser glazing provided some of the first evidence of modified forms of aluminum. For the process to be successful, an aluminum nitride layer must form and must be contiguous with the aluminum. This requires thermodynamic balancing of the energy input with the metallurgical events taking place. Other elements in the aluminum alloy could retard the formation of the aluminum nitride, or limit the thickness and /or integrity of the hard layer. If the appropriate control of the processing parameters can be identified and maintained, it is expected that the hardness of the aluminum surface could be increased by as much as twelvefold. The surface hardening of aluminum alloys is highly desired for automotive and aerospace applications, and if the feasibility of the process is established, further research would need to be conducted into limits of applicability, durability, and range of alloys appropriate for laser hardening.

这项探索性研究的小额赠款将建立一种新的准分子激光工艺对铝及其合金进行可控表面硬化的可行性。 铝合金319广泛用于工业应用，但不具有许多耐磨应用所需的硬度。 这种合金不能用常规方法硬化。 该项目将研究通过高度控制的能量输入到暴露于氮环境的表面来创建氮化铝表面层的潜力。 有几个冶金问题，使这是一个高风险的奋进。 热激光玻璃的早期工作提供了铝的改性形式的一些第一个证据。 为了使该工艺成功，必须形成氮化铝层，并且氮化铝层必须与铝邻接。 这需要能量输入与发生的冶金事件的热力学平衡。 铝合金中的其它元素可延迟氮化铝的形成，或限制硬层的厚度和/或完整性。 如果能够确定并保持对加工参数的适当控制，预计铝表面的硬度可以增加多达十二倍。 铝合金的表面硬化对于汽车和航空航天应用来说是非常需要的，如果该工艺的可行性得到确定，则需要进一步研究适用性，耐用性和适用于激光硬化的合金范围的限制。