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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >An in vitro in vitro and in vivo in vivo characterization of fine WE43B WE43B magnesium wire with varied thermomechanical processing conditions
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An in vitro in vitro and in vivo in vivo characterization of fine WE43B WE43B magnesium wire with varied thermomechanical processing conditions

机译:体外体外和体内体内体内鉴于精细We43b We43b镁线,具有各种热机械加工条件

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Abstract Absorbable implants made of magnesium alloys may revolutionize surgical intervention, and fine magnesium wire will be critical to many applications. Functionally, the wires must have sufficient mechanical properties to withstand implantation and in‐service loading, have excellent tissue tolerance, and exhibit an appropriate degradation rate for the application. Alloy chemistry and thermomechanical processing conditions will significantly impact the material's functional performance, but the exact translation of these parameters to implant performance is unclear. With this in mind, fine (127 μm) WE43B magnesium alloy wires in five thermomechanical process (TMP) conditions (90% cold work [CW], and 250, 375, 400, and 450°C heat treatments) were investigated for their effect on mechanical and corrosion behavior. The TMP conditions gave clear metallurgical differences: transverse grain dimensions ranged from 200 nm (CW) to 3 μm (450°C), UTS varied from 324 MPa (450°C) to 608 MPa (250°C), and surgical knotting showed some were suitable (CW, 400°C, 450°C) while others were not (250°C, 350°C). In vitro and in vivo corrosion testing yielded interesting and in some cases conflicting results. After 1 month immersion in cell culture medium, wire corrosion was extensive, and TMP conditions altered the macrocorrosion morphology but not the rate or total release of magnesium ions. After 1 month subdermal implantation in mice, all wires were well tolerated and showed very little corrosion (per μCT and histology), but differences in localized corrosion were detected between conditions. This study indicates that WE43B wires treated at 450°C may be most suitable for surgical knotting procedures. ? 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 1987–1997, 2018.
机译:抽象的镁合金制成的吸收植入物可以彻底改变手术干预,细镁线对许多应用至关重要。在功能上,电线必须具有足够的机械性能以承受植入和在 - 使用的载入,具有优异的组织耐受性,并且具有适当的施用降解速率。合金化学和热机械加工条件将显着影响材料的功能性能,但这些参数对植入性能的确切平移尚不清楚。考虑到这一点,对五种热机械工艺(TMP)条件(90%冷轧机[CW]和250,375,400和450°C)进行效果,进行了精细(127μm)的镁合金线关于机械和腐蚀行为。 TMP条件发出清晰的冶金差异:横粒度范围为200nm(CW)至3μm(450℃),UTS从324MPa(450℃)变化至608MPa(250°C),并显示外科焦虑有些是合适的(CW,400℃,450℃),而其他物质不是(250°C,350℃)。体外和体内腐蚀检测产生了有趣,在某些情况下,结果相互矛盾。在细胞培养基中浸入1个月后,线腐蚀是广泛的,TMP条件改变了宏观腐蚀形态,但不是镁离子的速率或总释放。在1个月的小鼠中植入小鼠后,所有导线耐受良好,并且显示出很少的腐蚀(每μCT和组织学),但在条件下检测局部腐蚀的差异。该研究表明,在450℃下处理的WE43B电线可能最适合外科焦化程序。还2017年Wiley期刊,Inc。J生物密制Res B部分:苹果生物粉底,106B:1987-1997,2018。

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