Selective laser melting additive manufacturing of 7xxx series Al-Zn-Mg-Cu alloy: Cracking elimination by co-incorporation of Si and TiB2

Towards high-temperature applications of aluminium alloys enabled by additive manufacturing

“…The latter alloys were previously plagued by extensive hot cracking issues in AM due to their large solidification range. Several strategies recently developed to combat this issue include the introduction of solutes that reduce the freezing range of the alloys, such as Si [3][4][5], substrate/powder bed preheating [6], mixing of elemental powders [7], or promoting the formation of an equiaxed grain structure through chemical modification [8,9].…”

Recent advances in hot tearing during casting of aluminium alloys

“…The cooling rates associated with AM (10 4 -10 6 K/s as reported in Ref. [10]) are considerably steeper than those related to casting, and thus, solidification defects such as porosities/hot tears/distortion are often generated in the AM process, especially when printing wrought aluminium alloys [11][12][13].…”

Review of Powder Bed Fusion Additive Manufacturing for Metals

“…The microstructure evaluation of Al-3Ni-1Ti-0.8Zr (wt.%) alloy showed fine equiaxed grains nucleated on Al 3 (Ti,Zr) precipitates, and coarse columnar grains with higher cracking resistance as a result of a terminal Al-Al 3 Ni eutectic [275]. Another study worked to prepare crack-free 7xxx Al alloys through co-incorporation of submicron Si and TiB2 into the alloys [290]. Gharbi et al [291] reported the microstructure of as-SLMed AA7075 containing the quasi-crystalline phase (ν-phase) as the principal nano-structural feature.…”