TY - JOUR

T1 - Stainless steel reveals an anomaly in thermal expansion behavior of severely deformed materials

AU - Renk, Oliver

AU - Enzinger, Robert Josef

AU - Gammer, Christoph

AU - Scheiber, Daniel

AU - Oberdorfer, Bernd

AU - Tkadletz, Michael

AU - Stark, Andreas

AU - Sprengel, Wolfgang

AU - Pippan, Reinhard

AU - Eckert, Jürgen

AU - Romaner, Lorenz

AU - Ruban, Andrei

N1 - Publisher Copyright: © 2021 American Physical Society.

PY - 2021/11/30

Y1 - 2021/11/30

N2 - Thermal expansion of materials is of fundamental practical relevance and arises from an interplay of several material properties. For nanocrystalline materials, accurate measurements of thermal expansion based on high-precision reference dilatometry allow inferring phenomena taking place at internal interfaces such as vacancy annihilation at grain boundaries. Here we report on measurements obtained for a severely deformed 316L austenitic steel, showing an anomaly in difference dilatometry curves which we attribute to the exceptionally high density of stacking faults. On the basis of ab intio simulations we report evidence that the peculiar magnetic state of the 316L austenitic steel causes stacking faults to expand more than the matrix. So far, the effect has only been observed for this particular austenitic steel but we expect that other magnetic materials could exhibit an even more pronounced anomaly.

AB - Thermal expansion of materials is of fundamental practical relevance and arises from an interplay of several material properties. For nanocrystalline materials, accurate measurements of thermal expansion based on high-precision reference dilatometry allow inferring phenomena taking place at internal interfaces such as vacancy annihilation at grain boundaries. Here we report on measurements obtained for a severely deformed 316L austenitic steel, showing an anomaly in difference dilatometry curves which we attribute to the exceptionally high density of stacking faults. On the basis of ab intio simulations we report evidence that the peculiar magnetic state of the 316L austenitic steel causes stacking faults to expand more than the matrix. So far, the effect has only been observed for this particular austenitic steel but we expect that other magnetic materials could exhibit an even more pronounced anomaly.

UR - http://www.scopus.com/inward/record.url?scp=85121217015&partnerID=8YFLogxK

U2 - 10.1103/PhysRevMaterials.5.113609

DO - 10.1103/PhysRevMaterials.5.113609

M3 - Article

AN - SCOPUS:85121217015

VL - 5.2021

JO - Physical review materials

JF - Physical review materials

SN - 2475-9953

IS - 11

M1 - 113609

ER -