Assessment of grain boundary cohesion of technically pure and boron micro-doped molybdenum via meso-scale three-point-bending experiments
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In: Materials and Design, Vol. 207.2021, No. September, 109848, 24.05.2021.
Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - Assessment of grain boundary cohesion of technically pure and boron micro-doped molybdenum via meso-scale three-point-bending experiments
AU - Jakob, Severin
AU - Hohenwarter, Anton
AU - Lorich, Alexander
AU - Knabl, Wolfram
AU - Pippan, Reinhard
AU - Clemens, Helmut
AU - Maier-Kiener, Verena
N1 - Publisher Copyright: © 2021 The Authors
PY - 2021/5/24
Y1 - 2021/5/24
N2 - Grain boundary engineering plays a major role for controlling the properties of modern high-performance materials. Especially Mo and its alloys have advantageous high-temperature structural properties as well as a number of attractive functional properties. However, depending on the processing state, technically pure Mo is prone to intercrystalline failure at low temperatures. The addition of B and/or C is known to improve interface cohesion, allowing for a targeted improvement of mechanical properties through segregation engineering. In this work, the early stages of crack initiation of technically pure and B micro-doped Mo are investigated by scanning electron microscopy on the tension-loaded surface after three-point-bending of mm-sized specimens. Increased grain boundary cohesion is evident from a drastically reduced relative length of separated interfaces in the B-doped material. The presence of B at the grain boundaries is confirmed via atom probe tomography experiments.
AB - Grain boundary engineering plays a major role for controlling the properties of modern high-performance materials. Especially Mo and its alloys have advantageous high-temperature structural properties as well as a number of attractive functional properties. However, depending on the processing state, technically pure Mo is prone to intercrystalline failure at low temperatures. The addition of B and/or C is known to improve interface cohesion, allowing for a targeted improvement of mechanical properties through segregation engineering. In this work, the early stages of crack initiation of technically pure and B micro-doped Mo are investigated by scanning electron microscopy on the tension-loaded surface after three-point-bending of mm-sized specimens. Increased grain boundary cohesion is evident from a drastically reduced relative length of separated interfaces in the B-doped material. The presence of B at the grain boundaries is confirmed via atom probe tomography experiments.
UR - http://www.scopus.com/inward/record.url?scp=85107853688&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2021.109848
DO - 10.1016/j.matdes.2021.109848
M3 - Article
VL - 207.2021
JO - Materials and Design
JF - Materials and Design
SN - 0264-1275
IS - September
M1 - 109848
ER -
