High temperature deformation and in situ fracture measurements to understand grain size/binder effects in hardmetals

高温变形和原位断裂测量，以了解硬质合金中的晶粒尺寸/粘合剂效应

• 批准号: 2275746
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2275746
• 关键词: temperature; deformation; situ; fracture; measurements

The aim of the project is to examine the role of microstructure and binder chemistry on interface properties in crack growth. Different types of WC/WC grain boundaries (in terms of CSL) making up the material have been identified. Work is being done to fabricate double cantilever beams (DCB) around these boundaries with the objective of understanding interface properties. DCB tests have been performed on WC single crystals and large WC grains (~20-100 microm) as a basis for interface study: this is to be used as an opportunity to determine the surface energies of WC crystallographic planes and compare with density functional theory calculations from the literature. Future work will be concerned with studying WC/WC boundaries with cobalt infiltration or chromium layers. WC/WC cobalt infiltration occurs during creep due to grain boundary sliding. Chromium is added to inhabit grain growth.

该项目的目的是研究微观结构和粘结剂化学对裂纹扩展界面性能的作用。已经确定了构成材料的不同类型的WC/WC晶界（就CSL而言）。正在做的工作是制造双悬臂梁（DCB）围绕这些边界的目的是了解接口特性。DCB测试已经在WC单晶和大的WC晶粒（~20-100微米）上进行，作为界面研究的基础：这将被用作确定WC晶面表面能的机会，并与文献中的密度泛函理论计算进行比较。未来的工作将关注于研究WC/WC与钴渗透或铬层的边界。WC/WC钴渗透发生在蠕变由于晶界滑动。加入铬以抑制晶粒生长。