退火工艺对AlCuCrFeNi高熵合金微观组织与硬度的影响
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摘要
用真空电弧熔炼法制备了AlCuCrFeNi多主元高熵合金。利用X射线衍射仪、扫描电子显微镜、显微硬度仪等研究了AlCuCrFeNi铸态以及采用不同退火工艺后的微观组织和硬度。结果表明:AlCuCrFeNi合金在铸态下是由枝晶内富Cr、Fe元素的BCC固溶相、枝晶间富Al、Ni的B2相以及枝晶间富Cu的FCC固溶相组成,并伴有少量的金属间化合物AlFe_(0.23)Ni_(0.77),铸造硬度值约为(465±10) HV。随着退火温度升高,Cu元素发生扩散,FCC相变得粗大,合金的硬度值降低到400 HV左右,与铸态硬度相差不大,说明合金具有较高的热稳定性以及较好的高温使用性能。
AlCuCrFeNi high entropy alloy was prepared by vacuum arc melting. The microstructure and hardness of AlCuCrFeNi were studied by means of X-ray diffractometer, scanning electron microscope and microhardness tester. The results show that, the cast AlCuCrFeNi alloy consists of BCC solid solution phase which is rich in Cr, Fe elements in dendrite,Al, Ni rich B2 phase in dendritic phase and FCC solid solution phase in dendrite phase which is rich in Cu and a small amount of intermetallic compound AlFe_(0.23)Ni_(0.77), the microhardness of the cast alloy is(465 ±10) HV. The diffusion of Cu element occurs with the increase of annealing temperature. The FCC phase becomes coarse and the hardness of the alloy decreases to about 400 HV. There is little difference between the hardness and the as-cast alloy's hardness. The results show that the alloy has high thermal stability and high temperature performance.
AlCuCrFeNi high entropy alloy was prepared by vacuum arc melting. The microstructure and hardness of AlCuCrFeNi were studied by means of X-ray diffractometer, scanning electron microscope and microhardness tester. The results show that, the cast AlCuCrFeNi alloy consists of BCC solid solution phase which is rich in Cr, Fe elements in dendrite,Al, Ni rich B2 phase in dendritic phase and FCC solid solution phase in dendrite phase which is rich in Cu and a small amount of intermetallic compound AlFe_(0.23)Ni_(0.77), the microhardness of the cast alloy is(465 ±10) HV. The diffusion of Cu element occurs with the increase of annealing temperature. The FCC phase becomes coarse and the hardness of the alloy decreases to about 400 HV. There is little difference between the hardness and the as-cast alloy's hardness. The results show that the alloy has high thermal stability and high temperature performance.
引文
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[3]李安敏,张喜燕.Al对Al-Cr-Cu-Fe-Ni高熵合金的组织与硬度的影响[J].热加工工艺,2008,37(4):26-28.
[4]Pi Jinhong,Ye P,Zhang Hui,et al.Microstructure and properties of AlCrFeCuNix(0.6≤x≤1.4)high-entropy alloys[J].Materials Science and Engineering A,2012,534:228-233.
[5]Tong C J,Chen Y L,Yeh J W,et al.Microstructure characterization of AlxCo Cr Cu Fe Ni high-entropy alloy system with multiprincipal elements[J].Metallurgical and Materials Transactions A,2005,36(4):881-893.
[6]Guo S,Ng C,Liu C T.Anomalous solidification microstructures in Co-free AlxCr Cu Fe Ni2high-entropy alloys[J].Journal of Alloys and Compounds,2013,557:77-81.
[7]Wang Y P,Li B S,Ren M X,et al.Microstructure and compressive properties of AlCrFeCoNi high entropy alloy[J].Materials Science and Engineering A,2008,491(1):154-158.
[8]Li C,Li J C,Zhao M,et al.Effect of alloying elements on microstructure and properties of multiprincipal elements high-entropy alloys[J].Journal of Alloys and Compounds,2009,475(1):752-757.
[9]Ma S G,Chen Z D,Zhang Y.Evolution of microstructures and properties of the AlxCr CuFeNi2high-entropy allo ys[J].Materials Science Forum,2013,745-746:706-714.
[10]Lu Y,Gao X,Jiang L,et al.Directly cast bulk eutectic and near-eutectic high entropy alloys with balanced strength and ductility in a wide temperature range[J].Acta Materialia,2017,124:143-150.
[11]Sun Y,Zhao G,Wen X,et al.Nanoindentation deformation of a bi-phase AlCrCuFeNi2alloy[J].Journal of Alloys and Compounds,2014,608:49-53.