Thermomechanical response of an ultrafine-grained nickel-yttrium alloy

SCRIPTA MATERIALIA

卷:187

Article

Srinivasan, S.¹  Kale, C.¹  Hornbuckle, B. C.²  Darling, K. A.²  Peralta, P.¹  Solanki, K. N.¹ 

[1] Arizona State Univ, Sch Engn Matter Transport & Energy, Tempe, AZ 85287 USA

[2] Weap & Mat Res Directorate, Aberdeen Proving Ground, MD 21005 USA

关键词: Ultrafine-grained;    Creep;    Thermo-mechanical behavior;    Grain growth;   

DOI  :  10.1016/j.scriptamat.2020.06.068

来源: Elsevier

【 摘 要 】

Thermomechanical behavior of an ultrafine-grained nickel-yttrium alloy has been investigated through quasi-static (10(-4) s(-1)) and high temperature creep experiments under uniaxial compression along with post-deformed transmission electron microscopy (TEM) characterization. While the alloy possesses a quasi-static flow stress of similar to 1255 MPa at room temperature, the flow stress drops by about 80% at 873 K. TEM analysis showed negligible average grain growth over the entire temperature range tested. Furthermore, the alloy showed exceptional steady-state creep behavior owing to the relative stability of the grain size and interactions between dislocations/grain boundary and inclusions/dispersoids. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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