Effect of boron doping on grain boundary cohesion in technically pure molybdenum investigated via meso-scale three-point-bending tests
Artikel i vetenskaplig tidskrift, 2023

Molybdenum has numerous advantageous functional and high-temperature properties. However, plastic deformation as well as structural applications are limited due to a propensity for brittle, intercrystalline failure, especially at low temperatures. It is well known that oxygen segregations have a detrimental effect, whereas it is assessed that carbon and/or boron have a beneficial effect on grain boundary cohesion. An advanced approach for the improvement of these interfaces is segregation engineering, e.g. the addition of cohesion enhancing elements segregating to the grain boundaries. To investigate early stages of crack formation, three-point bending tests on recrystallized commercially pure and boron micro-doped molybdenum were conducted between −28 °C and room temperature. The tensile-loaded top surface of the specimens was examined post-mortem close to the final fracture area via scanning electron microscopy. The occurring separations of grains are investigated for distinct features and the chemical composition of the interface is complementary measured by atom probe tomography.


Segregation engineering

Interface cohesion

Atom probe tomography

Grain boundaries


Severin Jakob

Chalmers, Fysik, Mikrostrukturfysik

Montanuniversität Leoben

A. Hohenwarter

Montanuniversität Leoben

A. Lorich

Plansee AG

W. Knabl

Plansee AG

Reinhard Pippan

Erich Schmid Institute of Materials Science (ESI)

H. Clemens

Montanuniversität Leoben

V. Maier-Kiener

Montanuniversität Leoben

International Journal of Refractory Metals and Hard Materials

02634368 (ISSN) 22133917 (eISSN)

Vol. 113 106173




Annan materialteknik



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