Study of NiAl-based alloy parts produced by metal injection moulding

ABSTRACT

NiAl–(Cr, Mo, Zr) alloys were successfully prepared by metal injection moulding (MIM) technique as well as avoiding common defects produced by other processing techniques. Debinding and sintering process had an important influence on the quality of samples. The effect of sintering temperature and time on microstructure evolution and room-temperature mechanical performance of NiAl–(Cr, Mo, Zr) alloys were investigated. Due to the existence of high strength Cr(Mo), the yield strength of NiAl was significantly enhanced. With the increasing sintering temperature and time, the Cr(Mo) phase aggregated and grown. The sample sintered at 1390°C for 3 h exhibited optimal mechanical properties. The yield strength (YS), ultimate compressive strength (UCS) and elongation of the sample at room temperature were 1133 MPa, 3223 MPa and 25.5%, respectively. MIM had some advantages in the preparation of difficult-to-deform superalloy due to the near-net forming process.

KEYWORDS:

• NiAl-based alloy
• metal injection moulding
• sintering temperature
• compression performance

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors would like to thank the financial support from the National Natural Science Foundation of China [grant number 91860122].

Notes on contributors

Bao Wang

Bao Wang; [email protected]; Research direction: Integrative research on forming control of lightweight, heat resistant and hard to deformation materials; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China.

Dongjun Wang

Dongjun Wang; [email protected]; Research direction: Integrative research on forming control of lightweight, heat resistant and hard to deformation materials; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China.

Hanwei Ning

Hanwei Ning; [email protected]; Research direction: Fabrication and hot forming of fast solidification and hard deformation alloys; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001,China National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China.

Gang Liu

Gang Liu; [email protected]; Research direction: Precision plastic forming and microstructure and property control of lightweight structure; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001,China National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China.