Effect of short-range order on the high-temperature plastic deformation behavior of Ni-Cr-W,Ni-W,and Ni-Re single crystals  

作　　者：Koji Hagihara 

机构地区：[1]Department of Physical Science and Engineering,Nagoya Institute of Technology,Gokiso,Nagoya,Aichi 466-8555,Japan [2]Division of Materials and Manufacturing Science,Graduate School of Engineering,Osaka University,2-1 Yamadaoka,Suita,Osaka 565-0871,Japan

出　　处：《Journal of Materials Science & Technology》2023年第34期143-152,共10页材料科学技术（英文版）

基　　金：Iketani Science and Technology Foundation,Japan(No.0221044-A);Grant-in-Aid for Young Scientist(B)from the Japan Society for the Promotion of Science(JSPS;grant number:22760540).

摘　　要：The development of a Ni-based superalloy that consists of only theγ-solid-solution phase is highly desired for some applications such as high-temperature gas-cooled reactors in power plants.In this study,the temperature dependence of the plastic deformation behavior of Ni-22Cr-8W(at%)alloy was examined for the first time by using a single crystal,focusing on the influence of the short-range order(SRO),especially upon high-temperature deformation behavior.The critical resolved shear stress(CRSS)for(111)[10¯1]slip exhibited a rapid decrease as the temperature increased at low temperatures but an almost constant value of∼45 MPa between 500 and 900℃.In addition,a slight yield stress anomaly(YSA)was observed,reaching a maximum value at 1000℃.To clarify the influence of the SRO on the YSA behavior,the mechanical properties of Ni-8W and Ni-5Re single crystals were also examined.Similar temperature dependence for the CRSS,including the occurrence of slight YSA,was observed for Ni-8W,in which SRO developed.In the Ni-5Re single crystal in which SRO did not significantly develop,however,the CRSS monotonically decreased as the temperature increased.The results suggest that the presence of SRO in a Ni-Cr-W alloy contributes to the strengthening of the alloy not only at low temperatures but also at high temperatures up to∼1000℃.The results strongly suggested that the pseudo-PLC effect is related to the origin of YSA appearing in Ni-basedγ-solid-solution alloys at high temperatures.

关 键 词：Ni-based superalloy Short-range order(SRO) DISLOCATION Yield stress anomaly(YSA) 

分 类 号：TG146.414[一般工业技术—材料科学与工程]