研究掺杂了0.1%Fe、0.2%Fe 和0.5%Fe(摩尔分数)的电弧熔炼 NiAl?28Cr?6Mo 共晶合金在室温和高温条件的显微组织和力学性能。合金的均匀化热处理在 Ar 气气氛中于1300°C 条件下进行。采用金相分析技术、硬度测试、X 射线衍射分析技术及压缩试验对合金样品进行表征。结果表明，铸态和均匀态合金均呈较细的晶内共晶结构和较粗的晶间共晶结构。Fe 含量的增加导致共晶层粗化及共晶数量减少。在室温条件下所有实验合金均具有很高的压缩应力和应变。Fe 的添加对室温条件下合金的强度和延展性的影响较小；然而，Fe 的添加使合金的高温强度增加。高温条件下，X 射线衍射峰向低 Bragg 角方向移动，这表明 Fe 的添加使合金的晶格常数增大。
Room temperature and high temperature microstructural and mechanical properties of arc melted NiAl?28Cr?6Mo eutectic alloys doped with 0.1% Fe, 0.2% Fe and 0.5% Fe (mole fraction) were investigated. The homogenization heat treatment of the alloys was conducted at 1300 °C in Ar atmosphere. Microscopic analyses, hardness measurements, XRD measurements and compression tests were used to characterize the alloys. As-cast and homogenized alloys exhibit fine cellular eutectic structures with coarse intercellular eutectic structure. The increase in the content of Fe results in coarsening eutectic layers and the decrease in eutectic cells. All alloys have very high compressive stress and strain at room temperature. The addition of Fe has small negative impact on the strength and ductility of the alloys at room temperature. However, the addition of Fe increases the high temperature strength of the alloy. High temperature XRD patterns show that peaks shift to lower Bragg angles. This indicates that the lattice parameter of the alloys increases.
参考文献
| [1] | H.Assadi;M.Barth.Kinetics of Solidification of Intermetallic Compounds in the Ni-Al system[J].Acta materialia,19982(2):491-500. |
| [2] | F. Devred;G. Reinhart;G.N. Iles.Synchrotron X-ray microtomography of Raney-type nickel catalysts prepared by gas atomisation: Effect of microstructure on catalytic performance[J].Catalysis Today,20111(1):13-19. |
| [3] | Y. Xie;J.T. Guo;Y.C. Liang.Modification of NiAl-Cr(Mo)-0.15Hf alloy by Sc addition[J].Intermetallics,20096(6):400-403. |
| [4] | Y. Chen;H.M. Wang.Laser melted TiC reinforced nickel aluminide matrix in situ composites[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,20051/2(1/2):49-54. |
| [5] | R. Darolia W.S. Waiston.Mechanical properties of high purity single crystal NiAl[J].Intermetallics,199910(10):1195-1202. |
| [6] | Eryong Liu;Yimin Gao;Junhong Jia;Yaping Bai;Wenzhen Wang.Microstructure and mechanical properties of in situ NiAl-Mo_2C nanocomposites prepared by hot-pressing sintering[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2014:201-206. |
| [7] | G. Frommeyer;R. Rablbauer;HJ. Schafer.Elastic properties of B2-ordered NiAl and NiAl-X (Cr, Mo, W) alloys[J].Intermetallics,20103(3):299-305. |
| [8] | L.Y. Sheng;F. Yang;T.F. Xi.Improvement of compressive strength and ductility in NiAl-Cr(Nb)/Dy alloy by rapid solidification and HIP treatment[J].Intermetallics,2012:14-20. |
| [9] | L Y. Sheng;J. T. Guo;L Z. Zhou.Microstructure and compressive properties of NiAl-Cr(Mo)-Dy near eutectic alloy prepared by suction casting[J].Materials Science and Technology: MST: A publication of the Institute of Metals,20102(2):164-168. |
| [10] | H. Bei;E.P. George.Microstructures and mechanical properties of a directionally solidified NiAl-Mo eutectic alloy[J].Acta materialia,20051(1):69-77. |
| [11] | Liyuan Sheng;Lijun Wang;Tingfei Xi;Yufeng Zheng;Hengqiang Ye.Microstructure, precipitates and compressive properties of various holmium doped NiAl/Cr(Mo, Hf) eutectic alloys[J].Materials & design,201110(10):4810-4817. |
| [12] | 盛立远;杨芳;奚廷斐;郑玉峰;郭建亭.喷铸工艺制备NiAl-Cr（Mo）-（Hf,Dy）亚共晶合金的组织及室温力学性能[J].中国有色金属学报（英文版）,2013(4):983-990. |
| [13] | Lei Wang;Jun Shen;Zhao Shang;Jianfei Zhang;Yujun Du;Hengzhi Fu.Microstructure and mechanical property of directionally solidified NiAl-Cr(Mo)-(Hf, Dy) alloy at different withdrawal rates[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2014:113-121. |
| [14] | Shang, Zhao;Shen, Jun;Wang, Lei;Du, Yujun;Xiong, Yilong;Fu, Hengzhi.Investigations on the microstructure and room temperature fracture toughness of directionally solidified NiAl-Cr(Mo) eutectic alloy[J].Intermetallics,2015:25-33. |
| [15] | L.Y. Sheng;J.T. Guo;H.Q. Ye.Microstructure And Mechanical Properties Of Nial-cr(mo)/nb Eutectic Alloy Prepared By Injection-casting[J].Materials & design,20094(4):964-969. |
| [16] | Kaiwen HUAI;Jianting GUO;Zirong REN;Qiang GAO;Rui YANG.Effect of Nb on the Microstructure and Mechanical Properties of Cast NiAl-Cr(Mo) Eutectic Alloy[J].材料科学技术学报（英文版）,2006(02):164-168. |
| [17] | TANG Lin-zhi;ZHANG Zhi-gang;LI Shu-suo;GONG Sheng-kai.Mechanical behaviors of NiAl-Cr(Mo)-based near eutectic alloy with Ti, Hf, Nb and W additions[J].中国有色金属学报（英文版）,2010(02):212-216. |
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