SGER: Development and Investigation of the Abrasion Resistance of New Ultra-Hard AlCrB14 Modified by TiB2 and Binder Phase for Even Higher Abrasion Resistance

TiB 2和粘结相改性的新型超硬AlCrB 14材料的耐磨性研究Shyam Bahadur和Alan Russell，爱荷华州州立大学，艾姆斯，美国爱荷华州这项工作的目的是研究超硬硼化物材料的磨损行为。通过低速单点磨损和高速多点磨损试验研究了材料的耐磨性，并分析了应变速率、温度和氧化效应对材料耐磨性的影响。材料去除的机制将通过磨损表面的电子显微镜以及基板中的变形来研究。作为努力的一部分，它旨在合成一种新材料AlCrB14，作为AlMgB14的改性版本，并通过添加亚微米尺寸的TiB2来改变其晶粒结构和机械性能，包括断裂韧性，以获得优异的耐磨性。新材料的合成解决了由于挥发性和反应性Mg而在AlMgB14硼化物加工中涉及的环境问题。如果加工成功，有望获得硬度等于或大于立方氮化硼（CBN）的超硬材料。如果新材料的加工不成功，则将对硬度接近CBN的AlMgB14进行磨损研究。这些材料将在硬度、断裂韧性和弯曲性能方面进行表征，这些将与耐磨性相关。该项目是跨学科的，涉及材料开发和进一步改进，以提高摩擦学性能。新开发的材料在运土、采矿、凿岩和其他工具材料中的潜在应用的经济效益是巨大的。

Development and Investigation of the Abrasion Resistance of New Ultra-Hard AlCrB14 Modified by TiB2 and Binder Phase for Even Higher Abrasion ResistanceShyam Bahadur and Alan Russell, Iowa State University, Ames, IA, USAThe objective of this work is to study the abrasion behavior of ultra-hard boride materials. The abrasion resistance of the materials will be studied by single point abrasion at low speeds and multiple point abrasion at high speeds, and the effects of strain rate, temperature and oxidation effects will be analyzed. The mechanisms of material removal will be studied by electron microscopy of the abraded surfaces as well as the deformation in the substrate. As a part of the effort, it is intended to synthesize a new material AlCrB14, as a modified version of AlMgB14, and modify its grain structure and mechanical properties, including fracture toughness, by sub-micron size TiB2 additions for excellent abrasion resistance. The synthesis of the new material addresses to the environmental concerns involved in the processing of AlMgB14 boride because of the volatile and reactive Mg. If the processing is successful, super hard materials with hardness equal to or greater than that of cubic boron nitride (CBN) are expected to be obtained. If the processing of the new material is unsuccessful, the abrasion studies will be performed on AlMgB14 whose hardness is close to that of CBN. The materials will be characterized in terms of hardness, fracture toughness, and flexure properties and these will be related to the abrasion resistance. The project is cross-disciplinary involving materials development and further modification for enhanced tribological performance. The economic benefits of the newly developed materials for potential applications in earth moving, mining, rock drilling and other tool materials are tremendous.