A microscale additive manufacturing approach for in situ nanomechanics
A microscale additive manufacturing approach for in situ nanomechanics
复制标题
DOI：
10.1016/j.msea.2019.138441
复制
发表时间：
2019-11-08
期刊：
影响因子：
6.4
通讯作者：
Minary-Jolandan, M.
中科院分区：
文献类型：
--
作者：
Daryadel, S.;Behroozfar, A.;Minary-Jolandan, M.
扫描电子显微镜和透射电子显微镜中的原位纳米力学已成为直接观察金属和合金变形机制的金标准。提取的变形机制补充了充分了解这些材料的力学行为所需的工艺组织性能关系。微柱压缩可能是这类研究中最常用的方法。从块状材料制造微柱依赖于聚焦离子束(FIB)的球磨，这通常需要几十个小时的设备时间和相关费用。此外，FIB的重离子轰击可能会给材料带来损伤，进而可能导致对材料行为的妥协解释。我们引入了一种微尺度的添加制造(AM)方法，可以在室内环境中直接沉积金属和合金的纳米柱和微柱。除尺寸外，该工艺还允许控制熔敷金属和合金的微观结构。根据尺寸和微观结构的不同，一个典型的微柱可以在几分钟到几十分钟内以非常低的成本制造出来，并且没有任何梁引起的损坏。当与原位仪器相结合时，这种方法可以高通量地研究工艺微结构性能关系，特别是对于纳米晶体和纳米孪晶金属和合金。
In situ nanomechanics in scanning electron microscope (SEM) and transmission electron microscope (TEM) has been the gold-standard for direct observation of deformation mechanisms of metals and alloys. The extracted deformation mechanisms complement the process microstructure property relationship that is required for the full understanding of the mechanical behavior of these materials. Micro-pillar compression is perhaps the most frequently used method for such studies. Fabrication of micro-pillars from bulk materials relies on milling by the focused ion beam (FIB), which often requires several tens of hours of the equipment time, and the associated expenses. Additionally, the heavy ion bombardment by FIB may introduce damage into materials, which in turn may result in compromised interpretation of materials' behavior. We introduce a microscale additive manufacturing (AM) approach that enables direct deposition of nano-pillars and micro-pillars of metals and alloys in room environment. In addition to the size, this process allows control over the microstructure of the deposited metals and alloys. Depending on the size and microstructure, a typical micro-pillar can be fabricated in a few minutes to tens of minutes at very low cost and without any beam-induced damages. When combined with in situ instrumentation, this approach may enable high-throughput investigation of the process microstructure property relationship, in particular for nano-crystalline and nano-twinned metals and alloys.