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 -