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Ni_3Al,Ni_3Si,Ni_3Fe和Ni_3Mn等均属LI_2型晶体结构的A_3B型化合物。按其有序转变温度高于或低于熔化温度可分为两类,前者称为金属间化合物,后者称为有序合金。也有人按这些化合物屈服强度随温度改变的规律将它们分为两类。一类随温度升高,其屈服强度先上升后下降,呈现R现象,另一类的屈服强度随温度上升而单调下降,无R现象。Ni_3Al等金属间化合物的屈服强度与温度关系呈R现象,引起人们越来越多的关注。早
Ni_3Al, Ni_3Si, Ni_3Fe and Ni_3Mn belong to LI_2 type crystal structure A_3B type compounds. According to its orderly transition temperature above or below the melting temperature can be divided into two categories, the former known as the intermetallic compounds, the latter known as ordered alloys. Some people according to the yield strength of these compounds with the temperature changes in the law will be divided into two categories. One with the temperature, the yield strength first increased and then decreased, showing the R phenomenon, the other with the temperature rise and yield monotonous decline, no R phenomenon. Ni_3Al and other intermetallic compounds yield strength and temperature were R phenomenon, causing more and more attention. early