摘要
利用XRD,DTA和DSC分析了机械合金化80.7W-13.2Ni-6.1Fe(at%,下同)合金的相变和热稳定性。结果表明:球磨20h和60h的粉末在加热过程中发生不同的相变化。球磨60h粉末在退火过程中除了晶体缺陷和应力释放等过程以外,有明显的非晶晶化和NiW相析出过程。同时,机械合金化可以降低粉末的烧结温度,同未球磨粉末相比,球磨20h和60h的80.7W-13.2Ni-6.1Fe合金液相出现的温度均降低了200℃以上。
80.7W-13.2Ni-6.1Fe （at.%） tungsten heavy alloys with the structure of amorphous imbedded with residual nano-crystalline W from the elemental powders of W, Ni and Fe have been synthesized by mechanical alloying （MA）. Phase transformation and thermal stability of 80.7W-13.2Ni-6.1Fe （at.%） powders milled for 20 h and 60 h were investigated by means of XRD, DTA and DSC. Results show that the different phase transformations occur in the powders milled for 20 h and 60 h during the heating process. For the powders milled for 60 h, besides the relaxation of crystal defaults and lattice stress, the crystallization of amorphous and the precipitation of NiW phase were both evident during the annealing. Both the primary melting points of the 80.7W-13.2Ni-6.1Fe alloys milled for 20 h and for 60 h decreased by above 200℃, compared with the un-milled powder mixture.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2005年第11期1698-1702,共5页
Rare Metal Materials and Engineering
