TY - JOUR
T1 - Healing cracks in additively manufactured NiTi shape memory alloys
AU - Zhu, Jia Ning
AU - Ding, Zhaoying
AU - Borisov, Evgenii
AU - Yao, Xiyu
AU - Brouwer, Johannes C.
AU - Popovich, Anatoly
AU - Hermans, Marcel
AU - Popovich, Vera
PY - 2023
Y1 - 2023
N2 - The pursuit of enhancing NiTi superelasticity through laser powder bed fusion (L-PBF) and [001] texture creation poses a challenge due to increased susceptibility to hot cracking in the resulting microstructure with columnar grains. This limitation restricts NiTi's application and contributes to material waste. To overcome this, we introduce a pioneering approach: utilising spark plasma sintering (SPS) to heal directional cracks in [001] textured L-PBF NiTi shape memory alloy. Diffusion bonding and oxygen utilisation for Ti2NiOx formation was found to successfully heal the cracks. SPS enhances mechanical properties, superelasticity at higher temperatures, and two-way shape memory strain during thermomechanical cycling. This work provides an alternative solution for healing cracks in L-PBF parts, enabling the sustainable reuse of cracked materials. By implementing SPS, this approach effectively addresses hot cracking limitations, expanding the application potential of L-PBF NiTi parts while improving their functional and mechanical properties.
AB - The pursuit of enhancing NiTi superelasticity through laser powder bed fusion (L-PBF) and [001] texture creation poses a challenge due to increased susceptibility to hot cracking in the resulting microstructure with columnar grains. This limitation restricts NiTi's application and contributes to material waste. To overcome this, we introduce a pioneering approach: utilising spark plasma sintering (SPS) to heal directional cracks in [001] textured L-PBF NiTi shape memory alloy. Diffusion bonding and oxygen utilisation for Ti2NiOx formation was found to successfully heal the cracks. SPS enhances mechanical properties, superelasticity at higher temperatures, and two-way shape memory strain during thermomechanical cycling. This work provides an alternative solution for healing cracks in L-PBF parts, enabling the sustainable reuse of cracked materials. By implementing SPS, this approach effectively addresses hot cracking limitations, expanding the application potential of L-PBF NiTi parts while improving their functional and mechanical properties.
KW - healing crack
KW - Laser powder bed fusion
KW - NiTi alloys
KW - spark plasma sintering
KW - superelasticity
UR - http://www.scopus.com/inward/record.url?scp=85168248430&partnerID=8YFLogxK
U2 - 10.1080/17452759.2023.2246437
DO - 10.1080/17452759.2023.2246437
M3 - Article
AN - SCOPUS:85168248430
SN - 1745-2759
VL - 18
JO - Virtual and Physical Prototyping
JF - Virtual and Physical Prototyping
IS - 1
M1 - e2246437
ER -