摘要
采用X射线衍射(XRD)、扫描电子显微镜(SEM)和电子万能材料试验机研究了热处理工艺对定向凝固Ni_(36.5)Co_(30)Cr_(11)Fe_(11)Al_(6)Ta_(1.5)W_(4)高熵合金组织及力学性能的影响。结果表明,合金经1200℃、2 h的固溶处理后枝晶间无偏析,在700℃时效过程中合金中析出了TCP相和L1_(2)相;随时效时间增加,L1_(2)相逐渐长大而TCP相尺寸没有较大变化,合金屈服强度由511 MPa提升至597 MPa,合金经8 h时效后性能接近峰值;L1_(2)相带来的沉淀强化是合金屈服强度提升的主要原因。相关结果为定向凝固高熵合金的性能调控提供一定的参考。
The effect of heat treatment process on the microstructure and mechanical properties of directionally solidified Ni_(36.5)Co_(30)Cr_(11)Fe_(11)Al_(6)Ta_(1.5)W_(4)high entropy alloy was studied using X-ray diffraction(XRD),scanning electron microscopy(SEM),and an electronic universal material testing machine.The results show that there is no interdendritic segregation in the alloy after solid solution treatment at 1200℃for 2 h,and during aging process at 700℃,the TCP and L1_(2)phases precipitate in the alloy;with increase of the aging time,the sizes of L1_(2)phases increase while that of TCP phases did not change;with the increase of aging time,the yield strength of the alloy increases from 511 MPa to 597 MPa,which approaches the peak value of peroperty after aging for 8 h;the precipitation strengthening provided by L1_(2)phase is the main reason for the increase of yield strength of the alloy.The relevant results provide some references for the performance control of directionally solidified high entropy alloys.
作者
刘桐
封涵文
高雪峰
王刚
秦刚
陈瑞润
LIU Tong;FENG Han-wen;GAO Xue-feng;WANG Gang;QING Gang;CHEN Rui-run(National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China;Light and High Strength Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China;Dalian Haitai Bearing Manufacturing Company Limited,Dalian 116300,Liaoning,China)
出处
《铸造》
2026年第4期323-329,共7页
Foundry
基金
国家自然科学基金项目(52425401和52404357)。
关键词
定向凝固
高熵合金
L1_(2)相
热处理
力学性能
沉淀强化
TCP相
固溶处理
时效处理
directional solidification
high entropy alloy
L1_(2)phase
heat treatment
mechanical property
precipitation strengthening
TCP phase
solution treatment
aging treatment
