Influence of High Current Pulsed Electron Beam (HCPEB) Treatment on Wear Resistance of Hypereutectic Al-17.5Si and Al-20Si Alloys

Abstract

The paper reports an analysis of the effect of high current pulsed electron beam(HCPEB) on microstructure transformations and wear resistance of hypereutectic Al-Si alloys. HCPEB treatment with 2.5 J /cm2 energy density leads to the formation of “halo” centered on primary Si, composition homogeneity, the formation of supersaturated solid solution of Al and grain refinement of top melted surface layer. The wear resistance of 15 pulse-treated Al-17.5Si and Al-20Si alloys is drastically improved by a factor of 6.5 and 2, respectively. The increase of hardness in modified surface layer has a positive effect on wear of hypereutectic Al-Si alloys.

Investigation on the properties of anodic oxides grown on aluminium-silicon alloys irradiated by pulsed electron beam

“…Hao et al conducted several studies on pulsed electron beam irradiation of eutectic [10] and hypereutectic [11][12][13] Al-Si alloys. Al-Si12.6 was treated at 3 J/cm 2 with 10 pulses of 1 μs average duration.…”

Spheroidization Behavior of Nano-Primary Silicon Induced by Neodymium under High-Current Pulsed Electron Beam Irradiation

“…Still, these methods can only refine the primary silicon size to the micron level. The high-current pulsed electron beam (HCPEB) is a new type of ultra-rapid solidification technology that can refine the size of the phase to nanometers [10]. As a new type of high-density energy source, HCPEB employs accelerated electrons as energy carriers.…”

“…This yields metastable phases (e.g., supersaturated solid solution, nanocrystals and amorphous phases), which have excellent properties that are unattainable through conventional methods. Hao et al [10,11] employed HCPEB technology to treat hypereutectic aluminum-silicon alloys to obtain nano-Si phases, including fine eutectic Si phases and nano-primary Si phases. Therefore, HCPEB is an excellent surface modification technique for obtaining nanoscale silicon phases via the rapid heating and cooling effects induced by the electron beam.…”

Evolution of Al–19·4Si alloy surface structure after electron beam treatment and high cycle fatigue

“…Besides laser processing, another effective tool of high speed thermal treatment of aluminium alloys' surface is high intensity pulsed electron beams. [23][24][25][26][27][28][29][30][31] The aims of this work are to analyse the regularities of structure modification of Al-19?4Si alloy by high intensity pulsed electron beam, and to identify the mechanisms responsible for Al-19?4Si alloy failure subjected to multicycle fatigue tests.…”