Mechanical property and biological behaviour of additive manufactured TiNi functionally graded lattice structure

Abstract

The bio-inspired porous metallic scaffolds have tremendous potential as artificial bone substitutes. In this work, a radially graded lattice structure (RGLS), which mimic the structures of natural human bones, were designed and processed by laser powder bed fusion (LPBF) of martensitic Ti-rich TiNi powder. The morphologies, mechanical properties, deformation behaviour, and biological compatibility of RGLS samples were characterised in comparison to those in the uniform lattice structure. The results demonstrated that RGLS has superior biomechanical properties and biological compatibility than the uniform structures, which highlights a novel strategy for improving the performance of additively manufactured artificial implants.

Review on laser directed energy deposited aluminum alloys

“…where M, b and G denote the Taylor factor, burgers vector, and shear modulus of Al, which equals 3.06, 0.286 nm, and 25.4 GPa, respectively. λ represents the spacing of particles, which can be estimated by formula (9), where f and r denote the particle volume fraction and particle average radius, respectively. Second, there may be a strain field close to the precipitates and reinforcement particles when the interface between particles and matrix is coherent, offering an interaction effect with dislocations.…”

“…This fantastic development trend owes to four core advantages of metallic AM over traditional manufacturing: (i) high freedom in structural complexity; (ii) high utilization rate of feedstocks; (iii) achieving rapid prototyping; (iv) capability to integrate an assembly part into a single part. The aerospace industry is one of the leading drivers of AM [6][7][8][9]. With the demand to be lightweight, the proportion of Al alloy applied in aerospace structural parts and automotive fields is increasing continuously due to its excellent strength-ductility synergy, wear resistance, and thermodynamic stability [10][11][12].…”

Additive manufacturing of magnesium and its alloys: process-formability-microstructure-performance relationship and underlying mechanism

“…AM is a revolutionary technology that realizes intelligent stacking of materials through digital control, which can be utilized in preparation and repair of both metallic and nonmetallic materials [9][10][11]. From a viewpoint of engineering, AM technology has a very high freedom degree of manufacturing, thus allowing fabrication of parts with extremely complex structure [12]. In addition, AM has high material utilization.…”

Structural and Functional Adaptive Artificial Bone: Materials, Fabrications, and Properties

“…Biometals, including stainless steel and titanium alloy, possess distinguished mechanical properties and plastic toughness, and they can cause some complications and the release of toxic metal ions easily, and so on. [13][14][15][16][17] Bioceramics, including hydroxyapatite (HAP) and tricalcium phosphate (TCP), have great bioactivity, biocompatibility, and bone conductivity, but the major issue is their poor strength and low toughness. [18][19][20] Biopolymers, including poly (L-lactide) (PLLA) and poly (ε-caprolactone) (PCL), possess good biosafety, biodegradability, and formability, but their strength is insufficient, and their degradation products are acidic, easily resulting in aseptic inflammatory reaction.…”