Sn替代Si和B对Ti_(50)Ni_(22)Cu_(18)Al_4Si_4B_2合金机械研磨非晶化的促进作用  

THE ROLE OF Sn SUBSTITUTION FOR Si AND B TO ENHANCE THE AMORPHIZATION OF MECHANICALLY- MILLED Ti_(50)Ni_(22)Cu_(18)Al_4Si_4B_2 ALLOY

作　　者：张来昌[1] 沈智奇[1] 徐坚[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《金属学报》2004年第9期981-986,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金50371084和50323009资助项目

摘　　要：采用Sn替代Ti50Ni22Cu18Al4Si4B2合金中的Si和B,形成Ti50Ni22Cu18Al4Snx(Si0.67B0.33)6-x(x=0,3,6)系列合金.所有的预制合金碎屑经过机械研磨均发生非晶化转变.随着合金中Sn含量的增加,球磨产物中转变未尽的晶体相α—Ti含量减少.由Sn完全替代Si和B的Ti50Ni22Cu18A14Sn6合金,机械研磨可形成与熔体急冷几乎相同的单一均匀非晶相,过冷液态温度区间可达到66 K.Elements Si and B in the Ti50Ni22Cu18Al4Si4B2 alloy are substituted with Sn to form the Ti50Ni22Cu18Al4Snx,(Si0.67B0.33)(6-x)(x=0, 3, 6) series alloys. In all cases, mechanical milling of the prealloyed fragments results in the amorphization of the alloys. With increasing the Sn content in the alloys, the fraction of residual alpha-Ti crystallites in the final milled product was reduced. For the Ti50Ni22Cu18Al4Sn6 alloy, in which the Si and B are completely replaced with Sn, the nearly complete amorphization is achievable. A single amorphous phase, similar to the melt-quenched glass, formed in the milled alloy. Such a ball-milled glassy alloy exhibits a large supercooled liquid region about 66 K.

关 键 词：钛合金 机械合金化 非晶态合金 过冷液体 

分 类 号：TG139.8[一般工业技术—材料科学与工程]