选区激光熔融制备FeCoCrNiMn-(N,Si)高熵合金在冷轧变形及500℃长时间退火后的析出行为  

Precipitation in a selective laser melted FeCoCrNiMn‒(N,Si)high entropy alloy after cold rolling and prolonged annealing at 500℃

作　　者：张忠伦 顾及 宋旼[1] ZHANG Zhonglun;GU Ji;SONG Min(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;China National Building Material Group,Technology Innovation Academy,Zaozhuang 277100,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]中国建材集团科技创新研究院,山东枣庄277100

出　　处：《中南大学学报（自然科学版）》2024年第8期3014-3021,共8页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2022YFE0134400);国家自然科学基金资助项目(51971247);湖南省自然科学基金资助项目(2022JJ40588);湖南省教育厅优秀青年项目(23B0009)。

摘　　要：对选区激光熔融制备的FeCoCrNiMn-(N,Si)高熵合金先进行冷轧变形,然后在500℃进行长时间退火处理,研究长时间退火对其相稳定性及微观组织演变的影响。研究结果表明,在退火温度为500℃,退火时间为10~40 d时,合金基体内形成了3种类型的沉淀析出物(Cr_(2)N相、BCC-Cr相和L1_(0)-NiMn相),且氮原子的添加抑制了富FeCo相的形成;当退火时间从10 d增加到20 d时,沉淀物的尺寸显著增加。然而,当退火时间进一步增加到40 d时,沉淀物颗粒不长大,其尺寸保持不变。The high entropy FeCoCrNiMn-(N,Si)alloy prepared by selective laser melting was first cold-rolled and then annealed at 500℃for a long time.The effect of long annealing on the phase stability and microstructure evolution was studied.The results indicate that three types of precipitates(Cr_(2)N phase,BCC-Cr phase and L1_(0)-NiMn phase)form inside the alloy matrix after annealing at 500℃for 10−40 d.The existence of nitrogen atoms inhibits the formation of FeCo-rich phase.In addition,the size of precipitates increases obviously with the annealing time from 10 d to 20 d.While the annealing period further increases to 40 d,the size of precipitates particle remains the same.

关 键 词：高熵合金 氮掺杂 析出相 选区激光熔融 冷轧 退火处理 

分 类 号：TB35[一般工业技术—材料科学与工程]