The Effect of High-energy Ball Milling on the Microstructure and Properties of Ti-doped MgB2 Bulks and Wires☆
The Effect of High-energy Ball Milling on the Microstructure and Properties of Ti-doped MgB2 Bulks and Wires☆
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DOI：
10.1016/j.phpro.2015.05.090
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Fang Yang;G. Yan;Qingyang Wang;X. Xiong;S. Q. Li;Guoqing Liu;J. Feng;Y. Pang;Chengshan Li;Y. Feng;P. Zhang
中科院分区：
文献类型：
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作者：
Fang Yang;G. Yan;Qingyang Wang;X. Xiong;S. Q. Li;Guoqing Liu;J. Feng;Y. Pang;Chengshan Li;Y. Feng;P. Zhang
以Mg、B和Ti为原料，采用高能球磨法在室温下制备了MgB 2块体。将混合粉末使用10的球与粉末质量比球磨0-10 h，并在750 °C下烧结2 h。利用X射线衍射仪（XRD）和扫描电镜（SEM）对MgB 2的物相和显微结构进行了表征。XRD分析结果表明，球磨过程中有少量MgO杂质出现，且随着球磨时间的延长，MgO相的相对百分含量逐渐增加。结果表明，球磨5 h的试样晶粒均匀性最好。将研磨5小时的粉末进一步加工成线材。丝材样品采用原位粉末管法（PIT）制备。通过室温应力-应变测试分析了材料的力学性能，并通过4.2K下的电学测试研究了材料的超导行为。在4.2K和2 T下，临界工程电流I达到330 A以上（J_c超过2.2× 104 A/cm ~ 2）。
MgB2bulks were prepared by high-energy ball milling of Mg, B and Ti powders at ambient temperatures. The mixed powders were ball-milled for 0-10 h using a ball-to-powder mass ratio of 10 and sintered at 750 °C for 2 h. The phase and microstructure of MgB2were characterized by means of X-ray diffraction (XRD) and Scanning electron microscope (SEM). XRD results reveal the appearance of a small amount of MgO impurity, and the relative percentage composition of MgO phase is gradually increased with prolonged the milling time. It proved that the sample milled 5 h has the best homogeneity in grain size. The milled 5 h powders were further processed to wires. The wire samples were fabricated by thein-situpowder-in-tube (PIT) method. The mechanical properties were analyzed by stress-strain measurements at room temperature and the superconducting behaviors are investigated by electrical tests at 4.2 K. The critical engineering currentIcreaches above 330 A (Jceexceeding 2.2×104A/cm2) at 4.2 K and 2 T.