对具有包晶反应的Gd5Ge4金属间化合物进行激光区熔快速定向凝固实验,研究了Gd基磁致冷材料激光快速定向凝固过程中的相选择机制和显微组织特征.结果表明,激光区熔快速定向凝固后的Gd5Ge4合金具有明显的择优取向,合金在激光快凝条件下同时发生非晶化现象.GdsGe4合金定向凝固组织的片层间距随激光扫描速率的增加而减小,合金的凝固组织特征和激光扫描速率的关系符合J-H模型.
参考文献
| [1] | Pecharsky VK;Gschneidner KA .Giant magnetocaloric effect in Gd-5(Si2Ge2)[J].Physical review letters,1997(23):4494-4497. |
| [2] | Pecharsky A O;Gschneidner Jr K A;Pecharsky V K et al.[J].Journal of Alloys and Compounds,2002,338:126. |
| [3] | Choe W.;Pecharsky AO.;Gschneidner KA.;Young VG.;Miller GJ.;Pecharsky VK. .Making and breaking covalent bonds across the magnetic transition in the giant magnetocaloric material Gd-5(Si2Ge2)[J].Physical review letters,2000(20):4617-4620. |
| [4] | Morellon L;Algarabel P A;Ibarra M R et al.[J].Physical Review B,1998,58:R14721. |
| [5] | Haskel D;Lee Y B;Harmon B N et al.[J].Physical Review Letters,2007,98:247205. |
| [6] | Rao G H .[J].Journal of Physics: Condensed Matter,2000,12:L93. |
| [7] | Samolyuk GD.;Antropov VP. .Electronic structure and magnetic properties of Gd-5(Si1-xGex)(4)[J].Journal of Applied Physics,2002(10 Pt.3):8540-8542. |
| [8] | Harmon B N;Antonov V N .[J].Journal of Applied Physics,2003,93:4678. |
| [9] | Paudyal D;Pecharsky V K;Gschneidner Jr K A et al.[J].Physical Review B,2006,73:144406. |
| [10] | Skorek G.;Deniszczyk J.;Szade J. .Electronic structure of Gd-5(Si, Ge)(4)[J].Journal of Physics. Condensed Matter,2002(30):7273-7286. |
| [11] | Tishin A M;Spichkin Y I.The Magnetocaloric Effect and its Applications[M].Bristol:Institute of Physics Publishing,2003 |
| [12] | Tang H;Pecharsky V K;Samolyuk G D et al.[J].Physical Review Letters,2004,93:237203. |
| [13] | Tang H.;Pecharsky AO.;Schlagel DL.;Lograsso TA.;Pecharsky VK. Gschneidner KA. .Magnetic field induced phase transitions in Gd-5(Si1.95Ge2.05) single crystal and the anisotropic magnetocaloric effect[J].Journal of Applied Physics,2003(10 Pt.3):8298-8300. |
| [14] | Franco V;Pirota K R;Prida V M et al.[J].Physical Review B,2008,77:104434. |
| [15] | 傅恒志;郭景杰;刘林.Directional Solidification and Processing of Advanced Materials (先进材料定向凝固)[M].北京:科学出版社,2008:5. |
| [16] | 黄卫东,林鑫,王猛,沈淑娟,苏云鹏,刘振侠.包晶凝固的形态与相选择[J].中国科学E辑,2002(05):577-583. |
| [17] | 钟宏,李双明,吕海燕,刘林,邹光荣,傅恒志.Nd-Fe-B 包晶合金的定向凝固组织及相选择[J].中国科学G辑,2007(03):303-312. |
| [18] | 杨森,黄卫东,刘文今,苏云鹏,周尧和.激光超高温度梯度快速定向凝固研究[J].中国激光,2002(05):475-479. |
| [19] | 张亚玮,张述泉,王华明.激光熔化沉积定向快速凝固高温合金组织及性能[J].稀有金属材料与工程,2008(01):169-172. |
| [20] | Massalski T B.Binary Alloy Phase Diagrams[M].Materials Park,OH:ASM International,1990 |
| [21] | Fu H;Chen Y G;Tu M J et al.[J].Acta Materialia,2005,53:2377. |
| [22] | Ugurlu O;Chumbley LS;Schlagel DL;Lograsso TA .Characterization of an atypical Widmanstatten structure in Gd5Si2Ge2 alloys[J].Acta materialia,2005(12):3525-3533. |
| [23] | Zhang T B;Chen Y G;Fu H et al.[J].Chinese Science Bulletin,2005,50:1811. |
| [24] | 王猛 .Microstructure and Phase Selection in the Unidirectional Solidification of Zn-Cu Peritectic Alloy(Zn-Cu包晶合金定向凝固组织及相选择)[D].西安:西北工业大学,2002. |
| [25] | 周尧和;胡壮麒;介万奇.Solidification Engineering(凝固技术)[M].北京:机械工业出版社,1998:30. |
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%