A refinement of the Al-Ni-Pt phase diagram

作者：Grushko B^*; Kapush D

来源：Journal of Alloys and Compounds, 2014, 594: 127-132.

DOI：10.1016/j.jallcom.2014.01.114

• Transition metal alloys and compounds
• Phase diagrams

Phase equilibria in the Al-Ni-Pt alloy system were specified. The total compositional region of the ternary phase diagram can coarsely be divided into three peculiar subregions. Above similar to 70 at.% Al this alloy system is characterized by the formation of complex binary and ternary phases. Between similar to 40 and 70 at.% Al the structures based on the CsCl-type configuration dominate, while below similar to 40 at.% Al the structures are based on the FCC (Ni, Pt) solid solution. The high-Al subregion was completed with the recently revealed binary high-temperature "Al3Pt'' xi-phase (Bmmb (No. 63), a = 1.9718, b = 1.6228, c = 1.4266 nm), which was found to extend up to 1.6 at.% Ni. In the medium-Al subregion the ternary extension of the Al2Pt phase (beta*) separates the compositional regions extending from Al3Ni2 and Al3Pt2. At 900-1100 degrees C no complete separation was revealed between the compositional fields of the beta-phase and beta*. With decreasing temperature the total beta + beta* field shrinks around the compositional lines Al2Pt-Al2NiPt and AlNi-Al2NiPt. In the low-Al subregion the low-Ni limit of the xi-phase region, probably extending at low temperatures from Al3Ni5, was found to be below 4 at.%.

• 出版日期2014-5-5