Magnetron sputtered freestanding MgAg films with ultra-low corrosion rate

Jessen, Lea Katharina; Zamponi, Christiane; Willumeit‐Römer, Regine; Quandt, Eckhard

doi:10.1016/j.actbio.2019.05.060

Cited by 10 publications

(8 citation statements)

References 24 publications

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“…In the case of Mg-10Ag more and larger precipitates were detected which led to the formation of a galvanic cell and results in an increased corrosion rate. The lowest corrosion rate with 0.04 ± 0.01 mm/year was achieved for Mg-6Ag which is by a factor of approximately three lower than Mg (Jessen et al, 2019).…”

Section: Introductionmentioning

confidence: 81%

“…This microstructure will form due to agglomeration of Ag richer areas within a Mg based matrix. In the case of Mg-10Ag (also higher magnification) binary MgAg precipitates are formed, see Figure 2d (Jessen et al, 2019). The Mg-Ag precipitates could be not clearly assigned to the possible intermetallic phases like Mg 54 Ag 17 , Mg 7 Ag 3 , or Mg 3 Ag (Tie et al, 2014;Liu et al, 2015a,b;Ren et al, 2018).…”

Section: Analysis Of Microstructurementioning

confidence: 92%

“…The following targets were used for the different materials: pure Mg, pre alloyed targets of: Mg-2Ag, Mg-6Ag, Mg-8Ag, Mg-10Ag (FHR, Germany) the compositions of the alloys are given in wt%. The achieved composition of the sputtered films is equal to the target composition (Jessen et al, 2019). The sputtering power was set to 200 W for Mg (200 mm diameter) and to 50 W for all the Mg-Ag alloy targets (each 100 mm diameter).…”

Section: Experimental Fabricationmentioning

confidence: 99%

“…Due to the lowest surface energy of the (0001) plane of the hexagonal close packed structure the growth direction in [0001] is favored. (Thompson, 1990;ASM International, 1999;Gottstein, 2004;Mahieu, 2006;Jessen et al, 2019). Figure 2b shows a cross section of Mg at higher magnification.…”

Section: Analysis Of Microstructurementioning

confidence: 99%

“…The multi-phase microstructure was formed in the bulk material if no solution heat treatment was applied. Magnetron sputtered Mg-Ag films showed even lower corrosion rates compared to the bulk (Jessen et al, 2019). This is most probably the result of the special microstructure which is obtained by sputtering as well as the small grain diameter smaller than 1 µm.…”

Section: Introductionmentioning

confidence: 96%

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Mechanical Properties of Magnetron Sputtered Free Standing Mg-Ag Alloy Films

2019

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Magnesium based alloys gained great interest for medical biodegradable applications. Limitations arise from high corrosion rates and mechanical properties of the Mg based alloys. In recent work it was shown that the corrosion rate of a precipitate free Mg-6Ag thin film can be reduced by a factor of three compared to pure sputtered Mg. As Mg-6Ag combines the very promising corrosion results with a potential therapeutically use of Ag ions, the investigation of their mechanical properties is needed for a full characterization of Mg-Ag alloys as biodegradable material. In this work the Ag content was varied from 2 to 10 wt%. The investigated thin film samples were dog-bone shaped samples with a thickness of 20 µm. The samples were fabricated by a combination of UV lithography, sacrificial layer technique and magnetron sputtering. The mechanical properties were determined using uniaxial tensile test. Compared to pure Mg samples fabricated by the same processing route the yield strength is approximately doubled for Ag containing samples. For films with a Ag concentration up to 8 wt% the elongation at fracture reaches a value of ∼7%. Further increase of the Ag concentration leads to lower elongation at fracture. Thus, especially due to the low corrosion rate, Mg-6Ag shows the optimum of all investigated alloys, with a yield strength of ∼310 MPa and an elongation at fracture of ∼6%.

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Section: Introductionmentioning

confidence: 81%