AlCoCrNiSix高熵合金微观组织结构与力学性能

PDF(3403 KB)

材料工程 ›› 2012, Vol. 0 ›› Issue (1) : 5-8.

扫码查看或转发全文

AlCoCrNiSix高熵合金微观组织结构与力学性能

刘恕骞, 黄维刚

作者信息 +

Microstructure and Mechanical Performance of AlCoCrNiSix Highentropy Alloys

LIU Shu-qian, HUANG Wei-gang

Author information +

文章历史 +

摘要

通过XRD，SEM，EDS分析和显微硬度测试，系统研究了Si含量对AlCoCrNiSix高熵合金铸态组织的相结构变化、微观组织形貌特征和力学性能。结果表明：随Si含量的增加，合金相结构由单一的bcc1固溶体结构逐步转化为bcc1+bcc2结构共存，其中bcc1为AlNi基的固溶体，bcc2为CrSi固溶体。随Si含量的增加，合金的铸态组织由枝晶形态向胞状形态转变。微观组织中Al，Ni主要存在于枝晶内，Si则偏析于枝晶间。Si具有显著提高合金硬度的作用，硬度最大值达到HV991。

Abstract

The effects of Si contents on the variation of phase structure, microstructure characteristic and mechanical properties of AlCoCrNiSix highentropy alloys were characterized respectively by using of XRD, SEM, EDS and microhardness testing. The results reveal that alloys phase structure is transformed from the single bcc1 phase structure to the mixed bcc1+ bcc2 phase structure with the increase of Si contents. The bcc1 is an AlNi solid solution structure and the bcc2 is CrSi solid solution structure. The ascast microstructure of alloys has a change from the dendritic crystal morphology to the cellular crystal morphology with the Si content increasing. Al and Ni elements mainly exist in the dendritic crystal and Si element segregates in the interdendritic region within the ascast microstructure. The Si element plays an important role in the increasing hardness of the AlCoCrNiSix alloy significantly, the highest microhardness is up to HV991.

导出引用

刘恕骞, 黄维刚. AlCoCrNiSix高熵合金微观组织结构与力学性能[J]. 材料工程, 2012, 0(1): 5-8

LIU Shu-qian, HUANG Wei-gang. Microstructure and Mechanical Performance of AlCoCrNiSix Highentropy Alloys[J]. Journal of Materials Engineering, 2012, 0(1): 5-8

参考文献

［1］YEH J W，CHEN S K ，LIN S J，et al．Nanostructured highentropy alloys with multiple principal element［J］. Advanced Engineering Materials，2004，6(5)：299-303．
［2］汪志诚. 热力学?统计物理［M］. 北京:高等教育出版社，2003．
［3］YEH J W，CHEN S K，GAN J Y，et al．Formation of simple crystal structures in solidsolution alloys with multiprincipal metallic elements［J］．Metall Mater Trans A，2004，A35(8)：2533-2536．
［4］TONG C J，CHEN S K，YEH J W，et al．Microstructure characterization of AlxCoCrCuFeNi highentropy alloy system with multiprincipal elements［J］. Metall Mater Trans，2005，A36(4)：881-893．
［5］HUANG P K，YEH J W，SHUN T T，et al．Multiprincipalelement alloys with improved oxidation and wear resistance for thermal spray coating ［J］. Advanced Engineering Materials，2004，6(1-2)：74-78．
［6］刘源，陈敏，李言祥，等. AlxCoCrCuFeNi多主元高熵合金的微观结构和力学性能［J］.稀有金属材料与工程，2009，38(9)：1602-1606．
［7］梁秀兵，魏敏，程江波，等. 高熵合金新材料的研究进展［J］. 材料工程，2009，(12)：75-80．
［8］毛卫民．材料的晶体结构原理［M］. 北京：冶金工业出版社，2007．
［9］ZHU J M，FU H M，ZHANG H F，et al. Synthesis and properties of multiprincipal component AlCoCrFeNiSix alloys［J］.Materials Science and Engineering，2010，A527(27-28)：7210-7214．
［10］杨富民，姜文辉，孙晓峰，等. Si对K40S合金凝固过程及显微组织的影响［J］. 沈阳工业大学学报，2000，22(5)：380-383．
［11］LI C，LI C J，ZHAO M，et al．Effect of alloying elements on microstructure and properties of multiprincipal elements highentropy alloys［J］. Journal of Alloys and Compounds，2009，A475(1-2)：752-757．
［12］潘晓林，孙文儒，李战，等. 铸态GH742合金的凝固特点及枝晶偏析［J］.稀有金属材料与工程，2010，39(1)：55-60．
［13］JIENWEI YEH，SHOUYI CHANG，YUDER HONG，et al. Anomalous decrease in Xray diffraction intensities of CuNiAlCoCrFeSi alloy systems with multiprincipal elements［J］.Materials Chemistry and Physics，2007，103(1)：41-46?/p>