Structure and mechanical properties of Al–Si–Fe alloys prepared by short-term mechanical alloying and spark plasma sintering

Simultaneous improvement in the strength and corrosion resistance of Al via high-energy ball milling and Cr alloying

“…The compressive yield strength for SPS Al-20 wt.%Cr was revealed to be much higher than that of high-strength Al alloys (e.g. AA7075-T651, 557 MPa [2,3]) and is comparable with the strength exhibited by amorphous or nanocrystalline Al alloys [10,17,29]. SPS Al exhibited good ductility which supports the idea that the lack of ductility usually exhibited by nanocrystalline materials is not their inherent property [15,30].…”

“…HEBM followed by consolidation has previously been successful in synthesizing Al, Al-Fe, Al-Ti, Al-Mn, Al-Mg alloys [10][11][12][13][14][15][16][17] and ferrous alloys [18][19][20], exhibiting significantly improved properties, including strength [10][11][12][13][14][15][16][17]21] and corrosion resistance [22]. Furthermore, HEBM has been reported to impart a significant increase in the room temperature solubility of many elements [16,[23][24][25].…”

Mechanical properties and microstructure of spark plasma sintered nanostructured p-type SiGe thermoelectric alloys

“…It has generally been observed that materials (especially nanostructured materials) sintered employing SPS result in better mechanical properties than those sintered using other conventional techniques [72,73]. SPS is a pressure-assisted sintering process in which high amperage pulsed direct current is employed to sinter the samples under pressure.…”

“…This sintering process lowers both the sintering temperature as well the sintering time because the particles are heated rapid by a spark plasma, which has a surface activating and cleaning effect on the particles being sintered. The main advantage of SPS over its rival sintering techniques is that it leads to near-theoretical density in the SPS product while retaining the nano-scale features of the starting nanopowders post-sintering, both of which result in better mechanical properties of the sintered material [72,74]. However, this is very difficult in conventional sintering processes, because densification during sintering is always accompanied by microstructural coarsening due to extensive boundary and volume diffusion at longer duration of sintering cycles.…”

Bi-modally structured pure aluminum for enhanced strength and ductility

“…Recently, refining its internal structure to reach the nano-scale has been fostered; an approach motivated by the promise of better strength and ductility [1][2][3][4][5][6][7][8][9][10][11]. A successful technique to strengthen Al is mechanical milling (MM) [12] including cryomilling [13][14][15]. In spite of the intensive research efforts, the poor ductility of milled Al remains a challenge which limits its applications [15][16][17].…”