机械激活和固相反应合成Mg_2Ni合金

Preparation of alloy Mg_2 Ni by mechanical activation and consolidation

通过机械合金化机械激活和固相反应制备了Mg2 Ni合金 ,用XRD和EDS对合金进行了分析 .实验研究表明 :混合粉经机械研磨激活和适当增加固相烧结反应的温度 ,这样可有效增加固态扩散反应能力 ,有利于固相反应进行 ,使形成Mg2 Ni的量明显提高 .实验结果发现 ,成分配比、烧结反应温度及时间均影响最终Mg2 Ni的纯度 ,其中反应温度是影响固相反应Mg2 Ni形成的重要因素 ,当Mg增量取 0 .5 % ,烧结温度为 70 0℃ ,保温时间 6h时可得到组织单一和纯度较高的Mg2 Ni合金相 .

Alloy Mg2Ni is prepared by means of mechani cal activation and powder metallurgy. The resultant is examined by X ray diffra ction (XRD) and energy dispersion spectrometry (EDS). The results reveal that th e mechanical grinding of mixed powder and properly increasing the sintering temp erature can improve the solid state diffuse reaction, favoring the solid phase reaction so that the amount of generated Mg2Ni is increased remarkably. It is found that the compounding ratio, sintering temperature and its holding may each and all affect the purity of Mg2Ni, the temperature being the more important factor. When the addition increment of Mg is 0.5%,and the samples are kept at 7 00 ℃ for 6 hours in the furnace, an alloying phase of Mg2Ni with uniform stru cture and higher purity can be obtained.