TY - JOUR
T1 - A microscale additive manufacturing approach for in situ nanomechanics
AU - Daryadel, S.
AU - Behroozfar, A.
AU - Minary-Jolandan, M.
N1 - Funding Information:
In situ SEM experiments enable real-time monitoring of the deformation of the material and its correlation with the stress-strain behavior. SEM images of the micro-pillar pre- and post-compression, respectively, are shown in Fig. 5F and G. The post-compression SEM image reveals localized plasticity in micro-pillar deformation, supporting that the failure is of a ductile nature. Additionally, it can be observed that the pillar after compression still holds a strong adhesion with the substrate. This is very important since a weak adhesion with the substrate may compromise obtained mechanical properties. The choice of proper substrate is essential to ensure such strong adhesion in the AM process.This work was supported by the US NSF-CMMI (award # 1727539) and the US Office of Naval Research (award # N00014-15-1-2795).
Funding Information:
This work was supported by the US NSF-CMMI (award # 1727539 ) and the US Office of Naval Research (award # N00014-15-1-2795 ).
Publisher Copyright:
© 2019
PY - 2019/11/8
Y1 - 2019/11/8
N2 - 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.
AB - 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.
KW - In situ nanomechanics
KW - Metals and alloys
KW - Micro-pillar compression
KW - Micro-scale additive manufacturing (AM)
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U2 - 10.1016/j.msea.2019.138441
DO - 10.1016/j.msea.2019.138441
M3 - Article
AN - SCOPUS:85072572885
VL - 767
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
M1 - 138441
ER -