The effects of Sn addition on the microstructure of as-cast and as-extruded Mg-9Li alloys were investigated. The results show that α-Mg, β-Li, Li2MgSn, and Mg2Sn are primary phases in the microstructures of the as-c...The effects of Sn addition on the microstructure of as-cast and as-extruded Mg-9Li alloys were investigated. The results show that α-Mg, β-Li, Li2MgSn, and Mg2Sn are primary phases in the microstructures of the as-cast and as-extruded Mg-9Li-xSn （x=0, 5; in mass fraction, %） alloys. Li2MgSn phase evolves from continuously net-like structure in the as-cast state to fine granular in the as-extruded state. After the extrusion, Mg-9Li-5Sn alloy has finer microstructures. Li2MgSn or Mg2Sn compound can act as the heterogeneous nucleation sites for dynamic recrystallization during the extrusion due to the crystallography matching relationship Extrusion deformation leads to dynamic recrystallization, which results in the grain refinement and uniform distribution. The as-extruded Mg-9Li-5Sn alloy possesses the lowest grain size of 45.9 μm.展开更多
基金National Natural Science Foundation of China(Nos.U2037601,51821001)Key Basic Research Project of the National Basic Strengthening Plan,China(No.2022-xxxx-ZD-093-xx)。
基金Projects(51171212,50725413) supported by the National Natural Science Foundation of ChinaProject(2009AA03Z507) supported by the National High-tech Research Program of China+1 种基金Projects(2010CSTC-BJLKR,CSTC2010AA4048) supported by Chongqing Science and Technology Commission,ChinaProject(CDJXS10132203) supported by the Fundamental Research Funds for the Central Universities,China
文摘The effects of Sn addition on the microstructure of as-cast and as-extruded Mg-9Li alloys were investigated. The results show that α-Mg, β-Li, Li2MgSn, and Mg2Sn are primary phases in the microstructures of the as-cast and as-extruded Mg-9Li-xSn （x=0, 5; in mass fraction, %） alloys. Li2MgSn phase evolves from continuously net-like structure in the as-cast state to fine granular in the as-extruded state. After the extrusion, Mg-9Li-5Sn alloy has finer microstructures. Li2MgSn or Mg2Sn compound can act as the heterogeneous nucleation sites for dynamic recrystallization during the extrusion due to the crystallography matching relationship Extrusion deformation leads to dynamic recrystallization, which results in the grain refinement and uniform distribution. The as-extruded Mg-9Li-5Sn alloy possesses the lowest grain size of 45.9 μm.
文摘以改善冷轧Mg-Li系合金的变形能力为目的,系统研究了冷轧变形后的Mg-9Li-1Zn合金的退火热处理工艺,分析了退火温度和退火时间对合金组织和性能的影响.研究结果表明：Mg-9Li-1Zn合金适宜的退火温度为280~300℃,退火温度过高会出现晶粒长大,表面脱锂等现象.300℃退火60 min后,合金的维氏硬度值为426.7 MPa,充分完成再结晶软化的合金在后续冷轧时总变形率可达70%.合金的退火时间以保证α相的充分球化及组织的均匀化为准则,实验中确定的最佳退火制度为300℃保温60 min.
文摘目的研究松乳菇多糖体外对人骨肉瘤MG-63细胞生长、凋亡及凋亡相关蛋白的影响。方法体外培养MG-63细胞,将不同浓度的松乳菇多糖作用于细胞,MTT法检测不同时间点和不同浓度的松乳菇多糖对细胞生长的抑制作用; Annexin V-FITC/PI双染流式细胞仪检测对细胞凋亡的影响,并分析细胞周期; Western blot法检测Caspase-3、Caspase-9、Bax和Bcl-2蛋白的表达。结果松乳菇多糖可时间和浓度依赖性地抑制MG-63细胞的生长;通过阻滞G2-M期促进MG-63细胞凋亡;促进Caspase-3、Caspase-9和Bax蛋白的表达,抑制Bcl-2蛋白的表达。结论松乳菇多糖体外可抑制人骨肉瘤MG-63细胞的生长,诱导其凋亡,其诱导凋亡的作用机制与调节Caspase-3,Caspase-9,Bax和Bcl-2蛋白的表达有关。
