Preparation,microstructure and degradation behavior of Mg−2Zn−0.4Sc−0.2Zr alloy wire

A biodegradable Mg−2Zn−0.4Sc−0.2Zr(ZK20−0.4Sc)alloy wire with a diameter of 0.5 mm was prepared by a combination of hot extrusion and cold-drawing.The average grain size of ZK20−0.4Sc alloy wire on the longitudinal section along the drawing direction is approximately 7.3μm.The texture results show relatively strong<1020>and weak<1010>fiber texture components parallel to the drawing direction.The ZK20−0.4Sc alloy wire exhibits better mechanical properties with the tensile strength,yield strength and elongate of(329±2)MPa,(287±2)MPa and(14.2±0.5)%,respectively.The better mechanical properties are mainly attributed to the grain refinement strengthening,dislocation strengthening and precipitation strengthening.With the immersion time increasing to 14 d,the corrosion type transfers from filament corrosion and pitting corrosion to severe localized corrosion.

重症胰腺炎的早期多学科联合救治策略

国际急性胰腺炎专题研讨会议（2012年美国亚特兰大）对急性胰腺炎（acute pancreatitis,AP）分类和定义进行了修订,修改后确定急性胰腺炎分类为早期和晚期两个阶段,严重程度分为轻度、中度和重度.其中,重症急性胰腺炎（severe acute pancreatitis,SAP）是指具备AP的临床表现和生物化学改变,伴有持续性的器官功能衰竭＞48 h[1].SAP病情凶险,病死率高达36％～50％.尽快明确SAP诊断、准确判断SAP严重程度、早期干预、适时腹腔减压及多学科联合治疗,是SAP救治的关键所在。