高压截获十次准晶相关晶体相和纳米级超微粒

A NEW APPROXIMANT OF THE DECAGONALQUASICRYSTAL AND ULTRAFINE PARTICLES INTERCEPTED AND CAPTURED UNDER HIGH STATIC PRESSURE Yu Richeng

对Ａｌ＿（７０）Ｃｏ＿（１５）Ｎｉ＿（１０）Ｔｂ＿５合金进行了静高压（７．０ＧＰａ）熔态（１７００℃）淬火（冷却速率１０￣（２０）Ｃ／ｓ）处理，首次观察到一个新十次准晶相关晶体相。该相属底心正交晶体，晶胞参数为２．２８ｎｍ、ｂ＝１．６０ｎｍ、ｃ＝５．４６ｎｍ。通过高分辨像分析，给出了它的二维点阵模型。同时在样品中发现了尺寸均匀的纳米级非晶超微粒形成，超微粒为球形，直径３０～４０ｎｍ。

In this peper,we reported a new approximant of Al_(70)Co_(15)Ni_(10)Tb_5 decagonal qua-sicrystal obtained by quenching from melting state(1700℃)under high static pressure(7.0GPa) for the first time. The approximant is a B-type orthorhombic crystalline phase and itslattice parameters are a=2.28nm,b=1.6nm,c=5.46nm。A two-dimensional lattice model ofthe approximant is supposed by means of the high-resolution electron microscopy pattern. Besides,many ultrafine particles are found in this sample. They are spherical and their sizes are 30～40nm.