TY - JOUR

T1 - Thermally activated deformation processes in body-centered cubic Cr - How microstructure influences strain-rate sensitivity

AU - Maier, Verena

AU - Hohenwarter, Anton

AU - Pippan, Reinhard

AU - Kiener, Daniel

PY - 2015/3/31

Y1 - 2015/3/31

N2 - The microstructure dependent deformation behavior of chromium, especially in terms of strain-rate sensitivity (SRS), was studied by means of improved nanoindentation methods as a function of temperature. Cr was investigated in the single crystalline (sx) and ultrafine-grained (ufg) condition. With increasing temperature a decreasing SRS was determined for sx-Cr, while for ufg-Cr a significant increase upon overcoming the critical temperature T c was measured. This is attributed to the increased importance of dislocation-grain boundary interactions, and a change in the dominating deformation behavior.

AB - The microstructure dependent deformation behavior of chromium, especially in terms of strain-rate sensitivity (SRS), was studied by means of improved nanoindentation methods as a function of temperature. Cr was investigated in the single crystalline (sx) and ultrafine-grained (ufg) condition. With increasing temperature a decreasing SRS was determined for sx-Cr, while for ufg-Cr a significant increase upon overcoming the critical temperature T c was measured. This is attributed to the increased importance of dislocation-grain boundary interactions, and a change in the dominating deformation behavior.

KW - Bcc

KW - Critical temperature

KW - High temperature nanoindentation

KW - Ufg

UR - http://www.scopus.com/inward/record.url?scp=84930369505&partnerID=8YFLogxK

U2 - 10.1016/j.scriptamat.2015.05.001

DO - 10.1016/j.scriptamat.2015.05.001

M3 - Article

VL - 106

SP - 42

EP - 45

JO - Scripta materialia

JF - Scripta materialia

SN - 1359-6462

ER -