Zr_(55)Al_(10)Cu_(30)Ni_(5-x)Pd_x块状非晶合金的玻璃形成能力和热稳定性

GLASS-FORMING ABILITY AND THERMAL STABILITY OF BULK Zr55Al10Cu30Ni5-xPdx AMORPHOUS ALLOYS

用铜模铸造方法制备了不同尺寸的Zr55Al10Cu30Ni5-xPdx(x=0,1,3,5)块状非晶合金,采用X射线衍射(XRD)、扫描差热分析(DSC)和透射电镜(TEM)分别对Zr55A110Cu30Ni5-xPdx块状非晶样品的结构、热稳定性和微观组织进行了研究.结果表明:x=1时,合金具有最高的过冷液相区(高达100 K)及最大的热稳定性,而对合金的玻璃形成能力影响不大,这说明用适量的Pd代替Zr55Al10Cu30Ni5合金中的Ni会提高合金的热稳定性;x=3时,合金的热稳定性有所提高,但降低了合金的玻璃形成能力;x=5时,非晶合金的热稳定性和玻璃形成能力同时降低.

The influence of palladium on glass-forming ability (GFA) of bulk Zr55Al10Cu30Ni5-xPdx (atomic fraction, %) (x=0, 1, 3, 5) amorphous alloys was investigated by copper mold casting method. The structure, thermal stability and microstructure of the alloys were studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and transmission electron microscopy (TEM), respectively. It is identified that a new bulk amorphous alloy with the largest supercooled liquid region DeltaT(x) of 100 K was obtained when x=1. However, as x=3, the thermal stability of alloy increases a little but GFA decreases obviously.. when x=5, the thermal stability and GFA decreased simultaneously. It indicates that a proper amount of Pd substituting Ni in the alloy will increase the thermal stability.