Control of FeAl Composition Produced by SPS Reactive Sintering from Mechanically Activated Powder Mixture

Table 1

Average characteristics in terms of chemical composition and microstructure parameters (crystallite size, microdistortion level, and lattice parameter) for each class of MAP-mixtures (Fe + Al) in comparison with those obtained by a TURBULA classical mix. a_JCPDS Al = 0.4049 nm, a_JCPDS Fe = 0.2866 nm. ∗Average characteristics 𝑖 = ∑(Characteristic 𝑖 × yield of each granulometric class). ^◆Grain size given by suppliers.

Characteristics	TURBULA powders	MA powders resulting from the third ball-milling
		Polydispersity		Seaved—; grain-size ranges Φ (µm)
		Average*	3rd milling	Class A; < 125	Class B 125–250	Class C ≥ 250
Yield (%)	100%		96%	8 ± 4	17 ± 2	75 ± 03
Chemical composition
Global—ICP (%at. Fe)	53 ± 1	53 ± 3	53 ± 3	45 ± 3	47 ± 4	55 ± 3
Global—EDXS (%at. Fe)	53 ± 1	53 ± 2	53 ± 2	46 ± 2	49 ± 2	54 ± 1
Microstructure
Fe
Crystallite size (nm)	10–15 µm^◆	53	50	90 ± 5	67 ± 4	45 ± 3
Microdistortion level (%)		0.13	0.13	0.10	0.12	0.14
Lattice parameter (nm)	0.2866 (3)	0.2867 (1)	0.2867 (2)	0.2866 (9)	0.2867 (4)	0.2868 (3)
Al
Crystallite size (nm)	20 µm^◆	70	70	110 ± 7	87 ± 5	62 ± 3
Microdistortion level (%)		0.09	0.08	0.08	0.08	0.09
Lattice parameter (nm)	0.4049 (2)	0.4049 (9)	0.4050 (4)	0.4050 (2)	0.4050 (6)	0.4049 (7)