The Microstructure, Solidification Path, and Microhardness of As-Cast Ni-Al-Cr-Os Alloys in a Ni-Rich Region
Yan Lin,
Ming Wei,
Guangyu Yang,
Haiyan Liu,
Hui Ye,
Chunming Deng,
Lijun Zhang
Affiliations
Yan Lin
State Key Laboratory of Porous Metal Materials, Northwest Institute for Non-Ferrous Metal Research, Xi’an 710016, China
Ming Wei
State Key Laboratory of Porous Metal Materials, Northwest Institute for Non-Ferrous Metal Research, Xi’an 710016, China
Guangyu Yang
State Key Laboratory of Porous Metal Materials, Northwest Institute for Non-Ferrous Metal Research, Xi’an 710016, China
Haiyan Liu
State Key Laboratory of Porous Metal Materials, Northwest Institute for Non-Ferrous Metal Research, Xi’an 710016, China
Hui Ye
State Key Laboratory of Porous Metal Materials, Northwest Institute for Non-Ferrous Metal Research, Xi’an 710016, China
Chunming Deng
Institute of New Materials, Guangdong Academy of Sciences, National Engineering Laboratory for Modern Materials Surface Engineering Technology, The Key Lab of Guangdong for Modern Surface Engineering Technology, Guangzhou 510651, China
Lijun Zhang
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
In this study, nine as-cast Ni-Al-Cr-Os alloys were prepared, and their constituent phases and microstructure were examined using X-ray diffraction and electron probe microanalysis techniques. The solidification paths of all the alloys in a Ni-rich corner were revealed based on a detailed analysis of the as-cast microstructure. The liquidus cube of the quaternary Ni-Al-Cr-Os system in a Ni-rich corner was established accordingly. A eutectic-type invariant reaction on the liquidus surface was explicitly identified, and its reaction can be expressed as L → α + β + γ. No quaternary invariant reaction was found in the alloys following the addition of Os. The Ni-Al-Cr-Os alloy points were then vertically mapped onto the Ni-Al-Cr liquid phase projection to better observe the effect of Os addition on the solidification path of the Ni-Al-Cr system. It was found that the addition of a small amount of Os has no significant effect on the solidification path of the Ni-Al-Cr system. Furthermore, the microhardness of each alloy, which was determined to be in the range of 207 HV to 565 HV, was found to be closely related to the phase constitution and phase fraction of the alloy.
