Please wait a minute...
Chin. Phys. B, 2011, Vol. 20(10): 107503    DOI: 10.1088/1674-1056/20/10/107503
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Hot deformation in nanocrystalline Nd–Fe–B backward extruded rings

Li An-Hua(李安华), Zhao Rui(赵睿), Lai Bin(赖彬), Wang Hui-Jie(王会杰), Zhu Ming-Gang(朱明刚), and Li Wei(李卫)
Division of Functional Materials, Central Iron & Steel Research Institute, Beijing 100081, China
Abstract  Radially oriented Nd--Fe--B rings are prepared by backward extrusion of fine grained melt-spun powder. Melt-spun powder with the nominal composition of Nd$_{30.5}$Fe$_{\rm bal.}$Co$_{6.0}$Ga$_{0.6}$Al$_{0.2}$B$_{0.9}$ (wt{\%}) is used as starting material. The effects of process variables, such as deformation temperature ($T_{\rm d}$), strain rate ($\dot \varepsilon $) and height reduction  ($\Delta h% $), on the magnetic properties of the rings are investigated. A scanning electron microscope (SEM) equipped with an energy spectrum device is used to study the metallograph and microfracture of the extruded rings.  The $B_{\rm r}$ and ${(BH)}_{\rm max}$ reach the optimum values at $T_{\rm d}=800$ ${^\circ}$C, $\dot \varepsilon =0.01$ mm/s, and $\Delta h% =70$%. It is found by SEM observations that the particle boundaries, which  seemingly correspond to the interfaces of the starting melt-spun powders, emerge after the corrosion of metallography specimens. This is helpful for studying the effects of powder--powder interface on the local deformation and  deformation homogeneity in the rings. For different spatial positions of the extruded rings, there are characteristic metallographies and microfractures. The upper end of the rings has the least deformation and worst texture,  and therefore the worst magnetic properties. The magnetic properties in the radial direction increase slightly along the axis from the bottom to the middle, then steeply decrease at the upper end of the ring. The deformation  and the formation-of-texturing processes are discussed. The deformation and the texturing formation of melt-spun Nd--Fe--B alloys probably involve grain boundary sliding and grain rotation, the solution-precipitation process  and preferential growth of Nd$_{2}$Fe$_{14}$B nanograins along the easy growth $a$-axis.
Keywords:  radially oriented Nd-Fe-B rings      backward extrusion      microstructure      texture  
Received:  21 April 2011      Revised:  13 June 2011      Accepted manuscript online: 
PACS:  75.50.Ww (Permanent magnets)  
  62.20.F- (Deformation and plasticity)  
  62.25.-g (Mechanical properties of nanoscale systems)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 50804011 and 50931001).

Cite this article: 

Li An-Hua(李安华), Zhao Rui(赵睿), Lai Bin(赖彬), Wang Hui-Jie(王会杰), Zhu Ming-Gang(朱明刚), and Li Wei(李卫) Hot deformation in nanocrystalline Nd–Fe–B backward extruded rings 2011 Chin. Phys. B 20 107503

[1] Hinz D, Kirchner A, Brown D N, Ma B M and Gutfleisch O 2003 J. Mater. Process. Technol. 135 358
[2] Li X M, Fang Y K, Guo Z H, Liu T, Guo Y Q, Li W and Han B S 2008 Chin. Phys. B 17 1674
[3] Huang W G, Zhang X Q, Li G K, Sun Y, Li Q A and Cheng Z H 2009 Chin. Phys. B 18 5034
[4] Zhao J J, Xing R, Lu Y, Haosibayar Y, Zhao M, Jin X, Zheng L, Ning W, Sun Y and Cheng Z H 2008 Chin. Phys. B 17 2717
[5] Yoshikawa N, Iriyama T, Yamada H, Kasai Y and Panchanathan V 1999 IEEE Trans. Magn. 35 3268
[6] Grünberger W, Hinz D, Kirchner A, Müller K H and Schultz L 1997 J. Alloys Compd. 257 293
[7] Li A H, Li W, Lai B, Wang H J, Zhu M G and Pan W 2010 J. Appl. Phys. 107 09A725
[8] Lee R W, Brewer E G and Schaffel N A 1985 IEEE Trans. Magn. 21 1958
[9] Mishra R K, Chu T Y and Rabenberg L K 1990 J. Magn. Magn. Mater. 84 88
[10] Mishra R K, Panchanathan V and Croat J J 1993 J. Appl. Phys. 73 6470
[11] Green H W 1984 J. Geophys. Res. 89 4313
[12] Li L and Graham C D 1992 IEEE Trans. Magn. 28 2130
[1] Effect of thickness of antimony selenide film on its photoelectric properties and microstructure
Xin-Li Liu(刘欣丽), Yue-Fei Weng(翁月飞), Ning Mao(毛宁), Pei-Qing Zhang(张培晴), Chang-Gui Lin(林常规), Xiang Shen(沈祥), Shi-Xun Dai(戴世勋), and Bao-An Song(宋宝安). Chin. Phys. B, 2023, 32(2): 027802.
[2] Surface structure modification of ReSe2 nanosheets via carbon ion irradiation
Mei Qiao(乔梅), Tie-Jun Wang(王铁军), Yong Liu(刘泳), Tao Liu(刘涛), Shan Liu(刘珊), and Shi-Cai Xu(许士才). Chin. Phys. B, 2023, 32(2): 026101.
[3] Optical and electrical properties of BaSnO3 and In2O3 mixed transparent conductive films deposited by filtered cathodic vacuum arc technique at room temperature
Jian-Ke Yao(姚建可) and Wen-Sen Zhong(钟文森). Chin. Phys. B, 2023, 32(1): 018101.
[4] Microstructure and hardening effect of pure tungsten and ZrO2 strengthened tungsten under carbon ion irradiation at 700℃
Chun-Yang Luo(罗春阳), Bo Cui(崔博), Liu-Jie Xu(徐流杰), Le Zong(宗乐), Chuan Xu(徐川), En-Gang Fu(付恩刚), Xiao-Song Zhou(周晓松), Xing-Gui Long(龙兴贵), Shu-Ming Peng(彭述明), Shi-Zhong Wei(魏世忠), and Hua-Hai Shen(申华海). Chin. Phys. B, 2022, 31(9): 096102.
[5] Two-dimensional Sb cluster superlattice on Si substrate fabricated by a two-step method
Runxiao Zhang(张润潇), Zi Liu(刘姿), Xin Hu(胡昕), Kun Xie(谢鹍), Xinyue Li(李新月), Yumin Xia(夏玉敏), and Shengyong Qin(秦胜勇). Chin. Phys. B, 2022, 31(8): 086801.
[6] Surface chemical disorder and lattice strain of GaN implanted by 3-MeV Fe10+ ions
Jun-Yuan Yang(杨浚源), Zong-Kai Feng(冯棕楷), Ling Jiang(蒋领), Jie Song(宋杰), Xiao-Xun He(何晓珣), Li-Ming Chen(陈黎明), Qing Liao(廖庆), Jiao Wang(王姣), and Bing-Sheng Li(李炳生). Chin. Phys. B, 2022, 31(4): 046103.
[7] Thermoelectric enhancement in triple-doped strontium titanate with multi-scale microstructure
Zheng Cao(曹正), Qing-Qiao Fu(傅晴俏), Hui Gu(顾辉), Zhen Tian(田震), Xinba Yaer(新巴雅尔), Juan-Juan Xing(邢娟娟), Lei Miao(苗蕾), Xiao-Huan Wang(王晓欢), Hui-Min Liu(刘慧敏), and Jun Wang(王俊). Chin. Phys. B, 2021, 30(9): 097204.
[8] Effect of the potential function and strain rate on mechanical behavior of the single crystal Ni-based alloys: A molecular dynamics study
Qian Yin(尹倩), Ye-Da Lian(连业达), Rong-Hai Wu(巫荣海), Li-Qiang Gao(高利强), Shu-Qun Chen(陈树群), and Zhi-Xun Wen(温志勋). Chin. Phys. B, 2021, 30(8): 080204.
[9] Microstructure and magnetocaloric properties in melt-spun and high-pressure hydrogenated La0.5Pr0.5Fe11.4Si1.6 ribbons
Qian Liu(刘倩), Min Tong(佟敏), Xin-Guo Zhao(赵新国), Nai-Kun Sun(孙乃坤), Xiao-Fei Xiao(肖小飞), Jie Guo(郭杰), Wei Liu(刘伟), and Zhi-Dong Zhang(张志东). Chin. Phys. B, 2021, 30(8): 087502.
[10] Formation of nano-twinned 3C-SiC grains in Fe-implanted 6H-SiC after 1500-℃ annealing
Zheng Han(韩铮), Xu Wang(王旭), Jiao Wang(王娇), Qing Liao(廖庆), and Bingsheng Li(李炳生). Chin. Phys. B, 2021, 30(8): 086107.
[11] Effects of post-sinter annealing on microstructure and magnetic properties of Nd-Fe-B sintered magnets with Nd-Ga intergranular addition
Jin-Hao Zhu(朱金豪), Lei Jin(金磊), Zhe-Huan Jin(金哲欢), Guang-Fei Ding(丁广飞), Bo Zheng(郑波), Shuai Guo(郭帅), Ren-Jie Chen(陈仁杰), and A-Ru Yan(闫阿儒). Chin. Phys. B, 2021, 30(6): 067503.
[12] Effect of helium concentration on irradiation damage of Fe-ion irradiated SIMP steel at 300 ℃ and 450 ℃
Zhen Yang(杨振), Junyuan Yang(杨浚源), Qing Liao(廖庆), Shuai Xu(徐帅), and Bingsheng Li(李炳生). Chin. Phys. B, 2021, 30(5): 056107.
[13] Texture analysis of ultra-high coercivity Sm2Co7 hot deformation magnets
Qiang Ma(马强), Meishuang Jia(贾美爽), Zhifeng Hu(胡智峰), Ming Yue(岳明), Yanli Liu(刘艳丽), Tongyun Zhao(赵同云), and Baogen Shen(沈保根). Chin. Phys. B, 2021, 30(4): 047505.
[14] Leakage of an eagle flight feather and its influence on the aerodynamics
Di Tang (唐迪), Dawei Liu(刘大伟), Yin Yang(杨茵), Yang Li(李阳), Xipeng Huang(黄喜鹏), and Kai Liu(刘凯). Chin. Phys. B, 2021, 30(3): 034701.
[15] Fractal microstructure of Ag film via plasma discharge as SERS substrates
Xue-Fen Kan(阚雪芬), Cheng Yin(殷澄), Zhuang-Qi Cao(曹庄琪), Wei Su(苏巍), Ming-Lei Shan(单鸣雷), and Xian-Ping Wang(王贤平). Chin. Phys. B, 2021, 30(12): 125201.
No Suggested Reading articles found!