采用真空电弧熔炼水冷铜模吸铸法制备Ni-50％Sc合金(摩尔分数,下同),采用程序计算、光学和扫描电子显微镜分析B2-NiSc金属间化合物急冷快速凝固组织的演化规律,采用XRD和EDS分析合金组织的相组成.结果表明:以名义成分Ni-50％Sc配制合金,真空水冷铜模吸铸成d2、d5和d8mm急冷试样对应的凝固速率分别为3112、497.9和194.5 K/s.(R)=1.5 mm为临界尺寸,对应着凝固速率的骤然变化.因Sc含量的损失,枝晶间出现了共晶(Ni2Sc+NiSc)组织;R＞(Ro)(d5和d8mm试样),凝固组织为粗大枝晶B2-NiSc+共晶(Ni2Sc+NiSc)组织;R ＜(Ro)(d2 mm试样)为细小球状枝晶B2-NiSc+少量共晶(Ni2Sc+NiSc)组织.经Image-Pro Plus面积分析和计算,合金熔化过程中Sc烧损约为3.25％～3.31％,从理论上,通过亚快速凝固不能获得单相B2-NiSc.急冷快速凝固后组织经(970℃,72 h)均匀热处理后,d2 mm试样组织为粒状B2-NiSc+球状颗粒Ni2Sc,d5和d8 mm组织为粒状B2-NiSc+长条颗粒Ni2Sc.
参考文献
| [1] | Alan M. Russell.Ductility in Intermetallic Compounds[J].Advanced Engineering Materials,20039(9):629-639. |
| [2] | Wang, R.;Wang, S.;Yao, Y.;Liu, L.;Wu, X..The temperature-dependent elastic properties of B2-MgRE intermetallic compounds from first principles[J].Physica, B. Condensed Matter,20121(1):96-102. |
| [3] | E. Gonzalez;P. Jasen;J.M. Marchetti;G. Brizuela;A. Juan.Density functional and bonding study of hydrogen and platinum adsorption on B2-FeTi (111) slab[J].International journal of hydrogen energy,20123(3):2661-2668. |
| [4] | N. P. Diakonova;T. A. Sviridova;V. K. Semina.Intermetallic phase stability on high energy treatments (rapid quenching, ion irradiation and mechanical milling)[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,20041/2(1/2):199-204. |
| [5] | Zhaoping Cao;Shuhong Liua;Xu Fang;Kaiming Cheng;Qiannan Gao;Yong Du;Jiong Wang;Jun Zhang;Weidong Huang;Chengying Tang.Experimental investigation and thermodynamic analysis of the Sc-Ni system supplemented with first-principles calculations[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,2014:30-39. |
| [6] | Zhu, Daiman;Li, Changrong;Guo, Cuiping;Du, Zhenmin;Li, Junqin.Thermodynamic assessment of the Ni-Sc binary system[J].Calphad: Computer Coupling of Phase Diagrams and Thermochemistry,2015:106-112. |
| [7] | Kardellass, S.;Servant, C.;Selhaoui, N.;Iddaoudi, A.;Ait Amar, M.;Bouirden, L..Thermodynamic description of the Ni-Sc system[J].Calphad: Computer Coupling of Phase Diagrams and Thermochemistry,2013:59-65. |
| [8] | 林河成.中国金属钪材料的发展现状及其前景[J].中国有色冶金,2010(02):34-38,51. |
| [9] | 周书和;刘明;孙占红;迟志艳.金属快速凝固理论及材料制备方法[J].科学之友,2009(14):29-30. |
| [10] | 梅策香;柳钰;张小安.快速凝固的非平衡效应研究[J].材料导报,2009(11):90-93. |
| [11] | 刘胜杰;黄梦真.快速凝固技术的应用研究[J].农业网络信息,2013(3):9-10. |
| [12] | 杨伟;陈寿辉;张守银;余欢;严青松;蔡长春.冷却速率对AZ91D镁合金非平衡凝固组织的影响[J].中国有色金属学报,2014(3):593-599. |
| [13] | 蔡志勇;王日初;张纯;彭超群;解立川.快速凝固过共晶Al-Si合金的显微组织及其热稳定性[J].中国有色金属学报,2015(3):618-625. |
| [14] | 郭晋波;曹崇德;弓素莲;宋瑞波;白晓军;王建元;郑建邦;文喜星;孙占波.不同冷却条件下Cu60Co30Cr10合金的快速凝固[J].中国有色金属学报（英文版）,2013(3):731-734. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%