Liu Jingqi

Phase relations in the Nd–Al–Si system at 500°C

Abstract The partial isothermal section of the phase diagram of the Nd–Al–Si ternary system at 500°C (50 at.% Nd or less) has been investigated by X-ray diffraction analysis, differential thermal analysis, scanning electron microscopy and electron micro-probe analysis. The existence of six binary compounds, αNd 2 Si 3 , βNdSi x ( x ⩽1.8⩽2.0), NdAl, NdAl 2 , NdAl 3 and αNd 3 Al 11 , and three ternary compounds, NdAl 2 Si 2 ( γ ), NdAl 1.75 Si 0.25 ( δ ), NdAl 1.25 Si 0.25 ( η ), was confirmed. The ternary compound NdAl 1.5 Si 0.5 was not found in this section. This isothermal section consists of 11 single-phase regions, 21 two-phase regions and 11 three-phase regions. The compound NdAl 1.25 Si 0.25 has a large homogeneity range, while the other ternary compounds are non-solubility compounds.

Isothermal section of the phase diagram of the ternary system Dy–Ni–Ti at 773 K

Abstract The isothermal section of the phase diagram of the ternary system Dy–Ni–Ti at 773 K was investigated by X-ray diffraction, differential thermal analysis, optical microscopy and electron microscopy techniques. It consists of 14 single-phase regions, 25 two-phase regions and 12 three-phase regions. At 773 K, the maximum solid solubilities of Ti in Ni, Dy 2 Ni 17 , DyNi 5 , Dy 2 Ni 7 , DyNi 3 and DyNi 2 are about 7.5 at.% Ti, 5.0 at.% Ti, 3.5 at.% Ti, 2.0 at.% Ti, 3.0 at.% Ti, and 4.0 at.% Ti, respectively. The existence of any ternary compound was not observed. The decomposition of the NiTi compound was not observed under the present conditions.

Isothermal section of the phase diagram of the ternary system NdFeNi at 510°C

Abstract The isothermal section of the phase diagram of the ternary system NdFeNi at 510°C (35 at.%; Nd or less) was investigated by X-ray diffraction. The section consists of seven single-phase regions, twelve two-phase regions and six three-phase regions. New ternary intermetallic compounds were not found in this section.

Isothermal section of the phase diagram of the ternary system Co–Pr–Si at 500°C

Abstract The isothermal section of the phase diagram of the ternary system Co–Pr–Si at 500°C (60 at.% Pr or less) was investigated by X-ray diffraction, optical microscopy and electron microscopy techniques. The section consists of 22 single-phase regions, 48 two-phase regions and 27 three-phase regions. There exist five limit solid solutions in this system. The intermetallic compound CoPrSi 2 is a new phase found in this work.

Isothermal section of the phase diagram of the ternary system NdFeMn at room temperature

Abstract The isothermal section of the phase diagram of the ternary system NdFeMn at room temperature was investigated by X-ray diffraction. The section at room temperature consists of eight single-phase regions, fourteen two-phase regions and seven three-phase regions. The single-phase region τ (Fe 20 Mn 70 Nd 10 ) in the section is a new ternary intermetallic compound.

The isothermal section of the phase diagram of the ternary system AlSnY at room temperature

Abstract The isothermal section of the phase diagram of the ternary system AlSnY (65 at.% Y or less) at room temperature was investigated by X-ray powder diffraction, differential thermal analysis, optical microscopy, electron microscopy, electron spectrum and electron probe microanalysis techniques. The section at room temperature consists of ten single-phase regions, 18 two-phase regions and nine three-phase regions. The single-phase region π (Al 3 Sn 9 Y 8 ) in this section at room temperature is a new ternary intermetallic compound. It was found that no single phase Al 4 Y exists in the binary AlY. The other eight single-phase regions in the section correspond to binary intermetallic compounds in the systems AlSn, AlY and SnY. The range of all homogeneous phase fields of terminal solid solution is too small to be observed at room temperature.