Synthesis of Invar 36 type alloys from elemental and prealloyed powders by mechanical alloying

ABSTRACT

Invar 36 (Fe₆₄Ni₃₆) nanocrystalline powders were successfully obtained by the mechanical alloying process. The mechanically alloyed Invar 36 powders were obtained from both, Fe–Ni elemental and Fe–Ni₃Fe prealloyed powders. XRD, DSC and magnetic measurements were used to characterise the Invar 36 powders. The lattice parameter evolution versus temperature of Invar 36 powders was investigated by in-situ high-temperature X-ray diffraction (HT-XRD). For both, Invar 36 (Fe, Ni) and Invar 36 (Fe, Ni₃Fe) powders, the lattice parameter values are constant up to about 350°C. The magnetic measurement also indicated that the Invar 36-type alloys are formed after 16 h of milling.

KEYWORDS:

• Invar 36-type alloy
• mechanical alloying
• prealloyed powder

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

C. V. Prică http://orcid.org/0000-0003-4597-2236

B. V. Neamţu http://orcid.org/0000-0003-0666-8303

T. F. Marinca http://orcid.org/0000-0002-5531-5451

F. Popa http://orcid.org/0000-0002-8849-1902

I. Chicinaş http://orcid.org/0000-0002-6371-0689