摘要
以成分为Ｚｒ６５Ａｌ７．５Ｃｕ１７．５Ｎｉ１０的元素粉末混合物及ＡｌＮ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， ＡｌＮ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ＡｌＮ复合材料的结构特性、玻 璃转变与晶化行为 ＴＥＭ观察表明， ＡｌＮ第二相粒子弥散分布在非晶 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ＡｌＮ的Ｚｒ基非晶态合金相比，含５％～１０％ＡｌＮ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ＡｌＮ含量增至 ３０％，明显的玻璃 转变消失，Ｔｘ升高约２０Ｋ．
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.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2001年第3期279-286,共8页
Chinese Journal of Materials Research
基金
国家自然科学基金资助项目59971054和59823001.
