The Microstructure, Solidification Path, and Microhardness of As-Cast Ni-Al-Cr-Os Alloys in a Ni-Rich Region

被引：0

作者：

Lin, Yan ^{[1
]}

Wei, Ming ^{[1
]}

Yang, Guangyu ^{[1
]}

Liu, Haiyan ^{[1
]}

Ye, Hui ^{[1
]}

Deng, Chunming ^{[2
]}

Zhang, Lijun ^{[3
]}

机构：

[1] Northwest Inst Nonferrous Met Res, State Key Lab Porous Met Mat, Xian 710016, Peoples R China

[2] Guangdong Acad Sci, Natl Engn Lab Modern Mat Surface Engn Technol, Inst New Mat, Key Lab Guangdong Modern Surface Engn Technol, Guangzhou 510651, Peoples R China

[3] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

来源：

MATERIALS | 2023年 / 16卷 / 20期

关键词：

Ni-based superalloy; Ni-Al-Cr-Os; as-cast microstructure; solidification path; microhardness; NICKEL-BASED SUPERALLOY; THERMODYNAMIC DESCRIPTION; PHASE-DIAGRAM; DESIGN; CONSTITUTION;

D O I：

10.3390/ma16206777

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 -> alpha + beta + gamma. 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.

引用

页数：12