添加AlN对机械合金化Zr65Al7.5CU17.5Ni10非晶态合金热稳定性的影响

以成分为Zr65Al7.5Cu17.5Ni10的元素的粉末混合物及AIN颗粒为起始材料，经机械合金化形成非晶态合金为基体的复合材料，AIN添加量为5％－30％（体积分数，下同），利用X射线衍射（XRD），透射电子 显微镜（TEM）和差示扫描量热计（DSC）分析了含AIN复合材料的结构特性，玻璃转变与晶化行为，TEM观察表明，AIN第二相粒子弥散分布在晶Zr基合金基体上，粒子尺寸为20－200nm，仍为初始的晶体结构，与未添加AIN的Zr基非晶态合金相比，含5％－10％AIN的复合材料仍表现出较宽的过冷液态温度区域，玻璃转变温度（Tg)和晶化激活能（Ex)没有显著变化，但晶化起始温度（Tx)向高温移动大约10K，导致过冷液态温度区域的扩宽，AIN含量增至30％,明显的玻璃转变消失，Tx升高的20K。

EFFECT OF AIN ADDITION ON THE THERMAL STABILITY OF MECHANICALLY ALLOYED AMORPHOUS Zr65Al7.5Cu17.5Ni10 ALLOY

Elemental powder mixtures with a composition of Zr65Al7.5Cu17.5Ni10 together with 5%-30% AIN particles were mechanically alloyed to form an amorphous alloy matrix composite. The structural feature, glass transition and crystallization behavior of the AIN--containing composite were analyzed using X--ray diffraction (XRD), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). From TEM observation, it was shown that the AIN second phase particles with a size regioning from 20 to 200 um were homogeneously dispersed in the amorphous Zr--based alloy matrix, remained initial crystalline structure. Compared with the amorphous alloy without AIN, the composites with 5%-10% AIN exhibit a significant supercooled liquid region. No appreciable change in glass transition temperature (Tg) and crystallization activation energy (Ex) was found, but the onset temperature for the crystallization (Tx) increases by about 10K. It results in a broadening of the supercooled liquid region of the composite. With increasing the content of AIN particles up to 30%, the significant glass transition disappeared and the crystallization temperature for the composite is raised about 20K.