Effect of corrosion on mechanical behaviors of Mg-Zn-Zr alloy in simulated body fluid
Effect of corrosion on mechanical behaviors of Mg-Zn-Zr alloy in simulated body fluid
复制标题
模拟体液中腐蚀对Mg-Zn-Zr合金力学行为的影响
DOI：
10.1007/s11706-014-0258-4
复制
发表时间：
2014-09-01
影响因子：
2.7
通讯作者：
Chen, Min-Fang
中科院分区：
文献类型：
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作者：
Song, Rong;Liu, De-Bao;Chen, Min-Fang
研究了Mg-Zn-Zr合金在模拟体液（SBF）中不同浸泡时间的腐蚀对力学性能的影响。通过浸泡试验研究了材料在模拟体液中的腐蚀行为。用扫描电镜对腐蚀后的合金表面进行了观察。将挤压态Mg-2 Zn-0.8Zr镁合金的拉伸试样在模拟体液中浸泡0、4、7、10、14、21和28 d。在电子拉伸试验机上对试样的拉伸力学行为进行了测试。用扫描电镜观察断口形貌。结果表明，随着浸泡时间的延长，Mg-2 Zn-0. 8 Zr合金的抗拉强度、屈服强度和延伸率先迅速下降后缓慢下降。随着浸泡时间的增加，合金的断裂机制由韧性断裂向解理断裂转变，这是由点蚀引起的应力集中和脆性引起的。
The main purpose of this paper is to investigate the effect of corrosion on mechanical behaviors of the Mg-Zn-Zr alloy immersed in simulated body fluid (SBF) with different immersion times. The corrosion behavior of the materials in SBF was determined by immersion tests. The surfaces of the corroded alloys were examined by SEM. The tensile samples of the extruded Mg-2Zn-0.8Zr magnesium alloy were immersed in the SBF for 0, 4, 7, 10, 14, 21 and 28 d. The tensile mechanical behaviors of test samples were performed on an electronic tensile testing machine. SEM was used to observe the fracture morphology. It was found that with extension of the immersion time, the ultimate tensile strength (UTS), yield strength (YS) and elongation (EL) of the Mg-2Zn-0.8Zr samples decreased rapidly at first and then decreased slowly. The main fracture mechanism of the alloy transformed from ductile fracture to cleavage fracture with the increasing immersion times, which can be attributed to stress concentration and embrittlement caused by pit corrosion.