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Experimental confirmation of high-temperature phase boundaries in the nickel-rich part of Ni-Al-Cr system

Maciąg T., Migas D., Płachta A.

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 4

art. no. e203, 2022

Precise determination of the course of phase boundaries is particularly important for alloys operating at elevated temperatures. In the case of multi-component materials such as nickel superalloys, computational methods are often used for this purpose. They are based on binary and ternary systems and require reliable experimental data. Commonly used research methods for determining phase boundaries at elevated temperature have a number of limitations and it is difficult to interpret their results without the support of other studies. This work presents a series of experiments to confirm the course of phase boundaries γ′/(γ′ + γ) and (γ′ + γ)/γ in Ni-Al-Cr system, particularly at 600 °C. For this purpose, a series of alloys from Ni-rich part of Ni–Al-Cr ternary system was prepared by vacuum induction melting (VIM) and casting into graphite mold under an argon protective atmosphere. Samples after machining were subjected to compression tests using the Gleeble 3800 thermomechanical simulator at room temperature as well as directly at 600 °C after pre-heating at 1100 °C. Stress–strain curves of various character were obtained and were associated with the appropriate phase structure confirmed by X-ray diffraction (XRD) analysis. The relationship between the phase structure of the studied alloys and their mechanical properties has been proven. Compression results were compared with the results of hardness measurements, high-temperature calorimetric solution method and differential thermal analysis (DTA). The obtained results showed a very good agreement in terms of the course of the γ′/(γ′ + γ) and (γ′ + γ)/γ phase boundary in Ni-Al-Cr system.

Solid solutions based on the M5X3 binary compounds in the M-{Si, Ge}-Sb ternary systems (M - Ti, Zr, Y; X - Si, Ge, Sb)

Kozlov A. Yu., Pavlyuk V. V.

Prace Naukowe. Chemia / Wyższa Szkoła Pedagogiczna w Częstochowie

2003

Vol. 8

23--28

The solid solutions based on M5X3 binary compounds in Ti-{Si, Ge}-Sb, Zr-Si-Sb and Y-{Si, Ge}-Sb ternary systems at 400°C were found (str. Type Mn5Si3, space group P63/mcm). The crystal structure of Ti5Si2.76Sb0.24 (a=0.7500 nm, c=0.5182 nm) and Ti5Ge2.26Sb0.74(a=0.7604(5) nm, c=0.5260(3) nm) was investigated by single-crystal X-ray analysis. Continuous solid solutions between Y5Si3-Y5Sb3 and Y5Ge3-Y5Sb3 compounds were investigated by powder X-ray analysis. The solid solution Zr5SixSb3+y (x=0-1, y=0-1) is formed by interstitial of atoms of Si in triqonal antiprisms which are formed by Zr atoms in 6g sites in Zr5Sb3 (str. type Mn5Si3, space group P63/mcm) binary compound or substitution of atoms of Sb in 2b sites by Si atoms in Zr5Sb4 (str. type Ti5Ga4, space group P63/mcm) binary compound.