阐明微观结构改性对模拟体液中可生物降解 Mg4Zn 合金的应力腐蚀开裂的作用。
Elucidating the role of microstructural modification on stress corrosion cracking of biodegradable Mg4Zn alloy in simulated body fluid.
机构信息
Structural Nanomaterials Lab, PSG Institute of Advanced studies, Coimbatore 641004, Tamil Nadu, India; Departmement of Metallurgical Engineering, PSG College of Technology, Coimbatore 641004, Tamil Nadu, India.
Tissue Engineering Laboratory, PSG Institute of Advanced studies, Coimbatore 641004, Tamil Nadu, India.
出版信息
Mater Sci Eng C Mater Biol Appl. 2020 Jan;106:110164. doi: 10.1016/j.msec.2019.110164. Epub 2019 Sep 5.
This paper investigates the effect of microstructure modification by heat treatment on stress corrosion cracking (SCC) behavior of Mg4Zn alloy in simulated body fluid (SBF). Mg4Zn alloy in as cast, solution heat treated and peak aged conditions was susceptible to SCC in SBF when strained at 3.6 × 10 s. SCC index based on fracture energy is least for solutionized alloy (0.84), while 0.88 for as cast and peak aged alloys. Fractographic analysis indicates predominantly intergranular SCC for solution treated alloy initiated by anodic dissolution near grain boundaries. As cast and peak aged alloy shows mainly transgranular failure due to hydrogen embrittlement adjacent to secondary phase particles.
本文研究了热处理对 Mg4Zn 合金在模拟体液（SBF）中应力腐蚀开裂（SCC）行为的微观结构改性的影响。在 3.6×10-5s-1的应变速率下，铸态、固溶处理态和峰值时效态的 Mg4Zn 合金在 SBF 中均容易发生 SCC。基于断裂能的 SCC 指数，固溶处理合金的最小（0.84），而铸态和峰值时效合金的分别为 0.88。断口形貌分析表明，固溶处理合金的 SCC 主要由晶界附近的阳极溶解引发的晶间开裂，而铸态和峰值时效合金主要由于氢脆而在第二相颗粒附近发生穿晶断裂。
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