J Mater Sci Technol ›› 1997, Vol. 13 ›› Issue (3): 211-214.
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Xifeng YU and Zhuangi HU(State Key Lab. of RSA, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)Xiang LIU and Lizhi CHENG(Northeastern University, Shenyang 110006, China)