3D-Printing Damage-Tolerant Architected Metallic Materials with Shape Recoverability via Special Deformation Design of Constituent Material

Abstract

Architected metallic materials generally suffer from a serious engineering problem of mechanical instability manifested as the emergence of localized deformation bands and collapse of strength. They usually cannot exhibit satisfactory shape recoverability due to the little recoverable strain of metallic constituent material. After yielding, the metallic constituent material usually exhibits a continuous low strain-hardening capacity, giving the local yielded regions of architecture low load resistance and easily developing into excessive deformation bands, accompanied by the collapse of strength. Here, a novel constituent material deformation design strategy has been skillfully proposed, where the low load resistance of yielded regions of the architecture can be effectively compensated by the significant self-strengthening behavior of constituent material, thus avoiding the formation of localized deformation bands and collapse of strength. To substantiate this strategy, shape-memory alloys (SMAs) are considered as suitable constituent materials for possessing both selfstrengthening behavior and shape-recovery function. A 3D-printing technique was adopted to prepare various NiTi SMA architected materials with different geometric structures. It is demonstrated that all of these architected metallic materials can be stably and uniformly compressed by up to 80% without the formation of localized bands, collapse of strength, and structural failure, exhibiting ultrahigh damage tolerance. Furthermore, these SMA architected materials can display more than 98% shape recovery even after 80% deformation and excellent cycle stability during 15 cycles. This work exploits the amazing impact of constituent materials on constructing supernormal properties of architected materials and will open new avenues for developing high-performance architected metallic materials.

Laser powder bed fusion additive manufacturing of NiTi shape memory alloys: a review

“…The DCPD coating offered a good interface and microenvironment for the growth and adhesion of osteoblasts by in vitro cell experiments. Wu et al [177] prepared a bioactive coating rich in Ca and P elements by plasma electrolytic oxidation (PEO), and after heating recovery, (b) percentages of different strain components as functions of the global strain, (c) evolution of the shape-recovery rate under 15 deformation-recovery cycles, (d) schematic of the repeated landing of a landing leg when filled with NiTi architected materials as the energy-absorbing material [179]. Reprinted with permission from [179].…”

“…They studied the influence of number and arrangement of SMA wires on the vibration reduction effect of the structure, and experimentally verified the influence of the piezoelectric ceramic control strategy on the vibration reduction effect of the structure. As shown in figures 12(a)-(c), Xiong et al [179] proposed a damage-tolerant architecture by a novel constituent material deformation design strategy, which can solve the problem of engineering mechanical instability manifested as the emergence of localized deformation bands and collapse of strength. As shown in figure 12(d), they depicted a lander application with multiple landing legs that were filled with NiTi architected materials as the energy-absorbing material.…”

“…Potential applications (energy absorpation, and actuator) of NiTi structures. (a) A NiTi honeycomb sample before/afterand after heating recovery, (b) percentages of different strain components as functions of the global strain, (c) evolution of the shape-recovery rate under 15 deformation-recovery cycles, (d) schematic of the repeated landing of a landing leg when filled with NiTi architected materials as the energy-absorbing material[179]. Reprinted with permission from[179].…”

3D Chiral Energy-Absorbing Structures with a High Deformation Recovery Ratio Fabricated via Selective Laser Melting of the NiTi Alloy

“…The rapid development of additive manufacturing (AM) technology has facilitated the design and fabrication of complex lattice metamaterials, including honeycomb structures, octet truss, octahedrons, body-centered cubes (BCCs), , face-centered cubes (FCCs), and chiral structures . Materials used to prepare metamaterials include soft materials, such as rubber; plastic materials, such as aluminum and NiTi alloys; − and brittle materials, such as ceramics . The energy-absorbing capacity of these lattice structures depends on the plastic deformation and the failure of the material.…”

Compression Behavior and Failure Mechanisms of Bionic Porous NiTi Structures Built via Selective Laser Melting

“…This kind material also has excellent functional properties, including thermal protection, noise reduction, etc. [1][2][3][4].…”