TY - JOUR
T1 - Primary-transient creep and anelastic backflow of pure copper deformed at low temperatures and ultra-low strain rates
AU - SHEN, Jun jie
AU - IKEDA, Ken ichi
AU - HATA, Satoshi
AU - NAKASHIMA, Hideharu
N1 - Funding Information:
Foundation item: Project (12JCYBJC32100) supported by the Tianjin Research Program of Application Foundation and Advanced Technology, China; Project ([2013]693) supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry, China Corresponding author: Jun-jie SHEN; Tel: +86-13516233995; E-mail: sjj1982428@sina.com DOI: 10.1016/S1003-6326(16)64285-1
PY - 2016/7/1
Y1 - 2016/7/1
N2 - Creep and anelastic backflow behaviors of pure copper (4N Cu) with grain size dg=40 μm were investigated at low temperatures of T<0.3Tm (Tm is melting point) and ultra-low creep rates of ɛ˙=1×10−10s−1 by a high strain-resolution measurement (the helicoid spring specimen technique). Analysis of creep data was based on the scaling factors of creep curves instead of the conventional extrapolated steady-state creep rate. Power-law creep equation is suggested to be the best for describing the primary transient creep behavior, because the pre-parameter does not apparently change with elapsed time. The observed anelastic strains are 1/6 of the calculated elastic strains, and linear viscous behavior was identified from the logarithm plot of the anelastic strain rate versus anelastic strain (slope equals 1). Therefore, the creep anelasticity is suggested to be due to the unbowing of there-dimensional network of dislocations.
AB - Creep and anelastic backflow behaviors of pure copper (4N Cu) with grain size dg=40 μm were investigated at low temperatures of T<0.3Tm (Tm is melting point) and ultra-low creep rates of ɛ˙=1×10−10s−1 by a high strain-resolution measurement (the helicoid spring specimen technique). Analysis of creep data was based on the scaling factors of creep curves instead of the conventional extrapolated steady-state creep rate. Power-law creep equation is suggested to be the best for describing the primary transient creep behavior, because the pre-parameter does not apparently change with elapsed time. The observed anelastic strains are 1/6 of the calculated elastic strains, and linear viscous behavior was identified from the logarithm plot of the anelastic strain rate versus anelastic strain (slope equals 1). Therefore, the creep anelasticity is suggested to be due to the unbowing of there-dimensional network of dislocations.
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U2 - 10.1016/S1003-6326(16)64285-1
DO - 10.1016/S1003-6326(16)64285-1
M3 - Article
AN - SCOPUS:84991712965
SN - 1003-6326
VL - 26
SP - 1729
EP - 1735
JO - Transactions of Nonferrous Metals Society of China
JF - Transactions of Nonferrous Metals Society of China
IS - 7
ER -