【摘要】 Ｔｉ（７０）Ｎｉ（２０）Ｓｉ（１０）非晶合会在５００－８００℃范围内经１ｈ退火后。可形成平均晶粒度为８－１２０ｎｍ的纳米合金．Ｘ射线衍射（ＸＲＤ）和透射电镜（ＴＥＭ）的结果表明。不同平均晶粒度的纳米合金样品中，相的组成相同．即Ｔｉ２Ｎｉ和Ｔｉ５Ｓｉ３以及少量的α－Ｔｉ晶体相．显微硬度（ＨＶ）的测量表明，纳米合金样品的显微硬度值比铸态或非晶态样品高一倍左右，但是，随着平均晶粒度的减小，硬度值的变化并不满足线性的Ｈａｌｌ－ｐｅｔｃｈ关系。更多还原

【Abstract】 Nanocrystalline Ti70ONi20Si10 alloys with average grain sizes in the range of 8─120 nm are prepared by crystallization from amorphous precursor under isothermal heat treatment for 1h in the temperature interval of 500-800℃. X-ray diffraction and TEM analysis indicated that nanocrystalline Ti70Ni20Si10 alloy consists of three phases, i.e., Ti2Ni, Ti5Si3 and α-Ti. The values of Vickers hardness of the nanocrystalline alloy are higher than that of amorphous and as-cast samples, which does not increase linearly with reducing the grain size.更多还原