Surface integrity and process mechanics of laser shock peening of novel biodegradable magnesium–calcium (Mg–Ca) alloy

Sealy, Michael P.; Guo, Y. B.

doi:10.1016/j.jmbbm.2010.05.003

Cited by 79 publications

(46 citation statements)

References 33 publications

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“…In previous studies, it was shown that surface treatments (laser shock peening and burnishing) can significantly alter the surface integrity and significantly (by up to four orders of magnitude) slow the initial degradation rate of a Mg alloy (in potentiodynamic corrosion studies) [10][11][12]18,36]. This study was an extension of these previous studies to look at the changes in surface integrity and mechanical properties initially as well as the degradation over time for two surface treatments (shot peening [SP] and burnishing).…”

Section: Discussionmentioning

confidence: 99%

“…For many other applications, it is known that modifying the surface integrity of a material can affect both mechanical and degradation properties. Several studies have shown the effects of Laser Shock Peening (LSP) [10][11][12][13][14][15][16][17], burnishing [18][19][20][21][22][23][24], and shot peening [25][26][27][28][29][30][31][32][33] on corrosion and fatigue performance. Specifically, techniques to mechanically induce increased residual stress in a surface layer have been shown to increase fatigue strength and slow the degradation rate.…”

Section: Introductionmentioning

confidence: 99%

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A Strategy to Optimize Recovery in Orthopedic Sports Injuries

Sealy¹,

Liu²,

Li³

et al. 2017

J Bioanal Biomed

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An important goal for treatment of sports injuries is to have as short a recovery time as possible. The critical problem with current orthopedic implants is that they are designed to be permanent and have a high complication rate (15%) that often requires removal and replacement with a second surgery; and subsequently a second rehabilitation cycle. This study tests the feasibility of having a device that provides the needed mechanical properties, to promote healing for a specified amount of time and then degrades away to shorten recovery time. The specific strategy was to create a surface layer on a degradable metal alloy with a controllable degradation rate. Previous studies have shown the feasibility of using surface treatments to alter the surface integrity (i.e., topography, microhardness, and residual stress) leading to increased fatigue strength and a decreased degradation rate. This study was an extension of these previous studies to look at the changes in surface integrity and mechanical properties initially as well as the degradation over time for two surface treatments (shot peening and burnishing). Although the treatments improved initial properties and the burnishing treatment slowed the degradation rate, the faster degradation of the base material in vitro (compared to previous studies) probably reduced the overall impact. The study helped support the feasibility of this approach by showing the ability of the surface treatment to modify surface integrity, initial mechanical properties, and degradation rate; the degradation rate of the base material used needs to be slower and/or the surface treatment needs to create a bigger change in the degradation rate. Further it ultimately needs to be shown that the surface treatment can produce a material that will allow orthopedic devices to meet the required clinical design constraints in vivo.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Strategy to Optimize Recovery in Orthopedic Sports Injuries

Sealy¹,

Liu²,

Li³

et al. 2017

J Bioanal Biomed

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show abstract

“…There are several variations of SPD based techniques such as high pressure torsion (HPT) [53][54][55], equal channel angular pressing (ECAP)/equal channel angular extrusion (ECAE) [56][57][58][59][60], cold rolling [61][62][63][64][65], hot rolling [66][67][68], high energy milling (ball milling) [69][70][71][72][73], sandblasting [74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90], and shot peening [91][92][93].…”

Section: Fabrication Of Nanocrystalline Metalsmentioning

confidence: 99%

“…Sealy et al [93] researched surface integrity and process mechanics of laser shock peening of novel biodegradable magnesium-calcium (Mg-Ca) alloy. An Nd:YAG laser (wavelength D 1,064 nm, pulse width (τ) = 5-7 ns, frequency (f) = 30 Hz) with power range 0.1-10 W was used in the experiments.…”

Section: Shot Peening and Laser Shock Peeningmentioning

confidence: 99%

Green Techniques for Biomedical Metallic Materials with Nanotechnology

Guo

Tam

2015

Green Processes for Nanotechnology

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From a clinic or medical viewpoint, it is important that the surgical implant retains a combination of high strength (including surface wear resistance), good biocompatibility, and chemical stability. To enable safe interactions between the surgical implants and tissues, surface modification and functionalization are commonly employed.Biological coatings such as TiN and titanium oxides are widely adopted and functionalized with various biological properties such as corrosion resistance, bioactivity, cytocompatibility, and bioconductivity. However, failure of the biological coatings due to the long term corrosion and wear or fretting is the main problem and debris from the materials is the main cause of joint replacement failure. Since the surgical implants are implanted into the human body for a long time, cyclic motions between the surgical implants and human tissues may disrupt the protective biological coatings accelerating corrosion and increasing the risks of immunological response by the leached metallic ions.Therefore, improved metallic biomaterials and the relevant manufacturing techniques are being introduced to meet this demand. Apart from the biocompatibility requirement, metallic biomedical materials also have to meet high standards regarding its performance (functionality, reliability) and selection criteria (cost, manufacturing ability). Up to now, the most often used metallic biomedical materials include stainless steel, cobalt-based alloys, and commercially pure titanium or titaniumbased alloys. However, the implant metallic biomaterials, like all mechanical components, are subjected to degradation and have limited lifetime. Damaged implant requires successive operation to replace worn components and so intensive efforts are made to increase durability of implants metallic biomaterials.For enhancing the mechanical retention, engineered nanostructures on the surface are normally taken to increase effective surface area on implant surfaces (such as both dental and orthopedic applications) to exhibit biological, mechanical, and morphological compatibilities to receiving vital hard/soft tissue, resulting in promoting osseointegration.

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“…With the action of plastic deformation, a certain degree of compressive residual stresses is introduced into the surface layer of materials [8], the microstructure of materials can be modified [6], and the surface integrity of workpiece changes [9] concurrently. The performances of materials subjected to surface strengthening are the concentrated reflection of the above-mentioned changes caused by plastic deformation.…”

Section: Introductionmentioning

confidence: 99%