非平衡凝固下Nd 8Fe (86)B 6合金的显微组织及凝固行为.doc

非平衡凝固下Nd_8Fe_(86)B_6合金的显微组织及凝固行为.doc• 954 •
铸造技术
FOUNDRY TECHNOLOGY
Vol. 32 No. 7
Jul. 2011
非平衡凝固下Nd8Fe86B6合金的显微组织及凝固行为
(渭南师范学院物理与电子工程系，• 954 •
铸造技术
FOUNDRY TECHNOLOGY
Vol. 32 No. 7
Jul. 2011
非平衡凝固下Nd8Fe86B6合金的显微组织及凝固行为
(渭南师范学院物理与电子工程系，陕西渭南714000)
摘要：%• Nd«Fcm K合金随春冷却速度的 增大，组织发生明显变化•・ K/s■组成相为Nd?Fe“B・(rFe和富B相：“〜3. 95 X105 K/$之间组成和为NdgFgB和a・Fe#ib当冷却谴率介于3. 95X 10s〜 X 10' K/s时•相组成为Nd/gB相和非晶 相： K/s时组织为完全的非抽相。随務冷却速率的埔大•&个相的尺寸由微米圾别减小列纳米级别* 关律词：N血FgR合全；冷却速率；显微组织；蛾宙行为
中图分类号:TG114;TG244 文纖标识码：A 文章编号：1000 8365(2011 )07-0954-04
Non-equilibrium Solidification Process and
Microstructure of Nd8Fe86B6 Alloy
GUO Bao-hui
(Department of Physical and Electronic Engineering* Weinan Teachers University9 Weinan 714000, China) Abstract：The non-equilibrium solidification process and the microstructure of NdsFeseB6 alloy were studied ・ The results show that the microstructures of the alloy changed with the in crease in cooling rate. The phases were composed of NcfeFewB, a-Fe and boron rich phase at the cooling rate below x 103 k/s. However, the phases consisted of NcbFeuB and a・Fe in the cooling rate range of 1 ・ 3 x 103 〜3 ・ 95 x IO： k/s. There were Nd2FeuB with grains in nanometer size and most amorphous in the range of x 10'〜 x 105 K/s・ As the cooling rate beyond 5. 39 x 105 K/s, there were entire