摘要
用差示扫描量热法(DSC)研究了非晶态合金Ni-RE-P(RE=Y,Ce,Sm,下同)的热稳定性;用X-光衍射(XRD)和扫描电镜(SEM)检测了在不同温度范围处理的样品的结构变化.结果表明,向非晶态Ni-P合金中加入少量稀土元素(Y,Ce,Sm),可显著提高非晶态Ni-RE-P 合金的热稳定性.样品的晶化激活能数据表明,Ni-RE-P 的各转变阶段的激活能都比Ni-P的大,说明Ni-RE-P 比Ni-P 更难晶化,即Ni-RE-P 比Ni-P更稳定.
The thermal stability of amorphous Ni-RE-P(RE=Y,Ce,Sm)alloy has been stu-died by differential scanning calorimetry(DSC)in this paper.X-ray diffraction(XRD)and scanning electron microscope(SEM)were used to examine the structurechange of the samples heated at different temperatures.The results showed that a smallamount of rare earth elements(Y,Ce,Sm)added into amorphous Ni-P alloy could con-siderably enhanced the thermal stability of amorphous Ni-RE-P alloy.For example,only one exothermic peak appeared at 629K for Ni-P,while the temperature of ma-ximum exothermic peak which was regarded as crystallization of amorphous Ni-Y-P,Ni-Ce-P and Ni-Sm-P alloys was at 786K,795K and 742K respectively.With in-creasing of the treatment temperature,the amorphous Ni-P and Ni-RE-P alloys wereprogressively crystallized to be simultaneous with presentation of the fine crystals Niand Ni_3P and the fine crystals grew up to greater crystalline particles due to aggre-gation of them in the bulk.It was showed that the value of activation energy of the crystallization of Ni-RE-P was much greater than that of Ni-P,this indicated that the crystallization of Ni-RE-P was more difficult than that of Ni-P.A small amount of rare earth element(Y,Ce,Sm)played an important role in enhancing the thermal stability of amor-phous Ni-RE-P alloy.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1993年第3期325-330,共6页
Acta Physico-Chimica Sinica
关键词
稀土
非晶态合金
热稳定性
镍-磷
Rare earth(Y,Ce,Sm)
Amorphous alloy(Ni-P)
Thermal stability
Activation energy
DSC