Microstructure/Phase Evolution in Mechanical Alloying/Milling of Stainless Steel and Aluminum Powder Blends

Abstract

The present study aims to examine the phase evolution in blends comprising different proportions of stainless steel (316SS) and Al (0, 25, 65, and 85 wt pct) powders during high-energy ball milling through X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and high-resolution transmission electron microscopy (HRTEM). An attempt has also been made to study the hardness value of the bulk samples obtained by hot pressing the ball-milled powder blend at suitable temperature and pressure. The results on changes in the constituent phases and hardness value of the bulk samples obtained after consolidation of ball-milled alloy using the high-pressure technique have been reported.

Characterization of Fe–Cr–Mn–N amorphous powders with a wide supercooled liquid region developed by mechanical alloying

“…Although the majority of amorphous alloys are conventionally produced by melt-quenching techniques, mechanical alloying (MA) is a good alternative method to synthesize these alloys [2][3][4][5][9][10][11][12][13]. This method is one of the most promising and rapidly developing solid-state processing routes to produce non-equilibrium and metastable phases [14][15][16].…”

Microstructural, thermal and magnetic properties of amorphous/nanocrystalline FeCrMnN alloys prepared by mechanical alloying and subsequent heat treatment

“…Although the majority of amorphous alloys are conventionally produced by the rapid solidification method, the mechanical alloying (MA) technique is a promising alternative method to synthesize these alloys [2][3][4][5][6][7][8][9][10]. Based on the energy of the milling process and the thermodynamic properties of the constituent elements, the alloy can be rendered amorphous by this processing [11].…”

Magnetic response of Cu (25wt.%)-316 grade stainless steel processed by ball milling

“…Such a transformation of the Bravais lattice is attributed to the partitioning of austenite stabilizing elements of the stainless steel, like Ni, in elemental Cu resulting in preferential stabilization of bcc Fe phase. It is to be noted that earlier study on Al-316SS alloy has demonstrated oppositely that bcc Fe has transformed to fcc Fe by dissolution of alloying element of 316 SS [34]. The result of EDX analysis of Cu-316SS alloy powder obtained after 70 h of milling reveals uniform mixing and greater extent of homogeneity of the constituent elements.…”

“…The weak diffraction ring along with the prominent halo detected in the SAD pattern presented in Fig. 2 (b) has indicated the partial amorphisation in asmilled Cu-316SS alloy [34]. The bright-field HR-TEM image and SAD pattern of the powder blend obtained after ball milling for 70 h and after annealing of the same at 750°C for 1 h shown as Fig.…”