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Microstructure evolution and superplastic behaviors of ZK40 magnesium alloy were investigated in the temperature range of 473~623 K. Transmission electron microscopy (TEM) was used to study the microstructure changes, twinning occurred significantly after being processed by equal channel angular pressing (ECAP) for one pass through the die, the mean grain size was 5.6μm. Finer grains can be obtained after further processing through ECAP, the average grain size of the alloy processed by ECAP for three passes was as low as 0.8 μ_m; this alloy exhibited low temperature superplasticity at 473~523 K, elongations obtained at the same initial strain rate of 1×10~(-3) s~(-1) were 260% at 473 K and 612% at 523 K, respectively. Corresponding values for the ZK40 alloy processed by ECAP for only one pass were 124% at 473 K and 212% at 523 K, respectively; poor superplastic behavior of this material was related to the long-range stresses associated with the non-equilibrium grain boundaries within the coarse grains. The incompatibility between fine and coarse grains was thought to be unfavorable to the improvement of superplasticity. 相似文献
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1 .Introduction Molding sand ProPerties are elosely relevant to castingquality.During molding Proeess,molding sand ProPertiesean direetly affeet the quality of molds ineluding strength,dimension aeeuracy of mold 相似文献
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用循环伏安法制备了铜掺杂聚L-天冬氨酸修饰玻碳电极,研究了多巴胺(DA)和尿酸(UA)在该修饰电极上的电化学行为,建立了同时测定DA和UA的新方法。在pH3.5的磷酸盐缓冲溶液中,扫描速率为120mV]s时,DA和UA在该电极上产生氧化还原峰,峰电位分别为Eps=0.429V、Epc=0.336V(DA)和Eps=0.617V(UA),DA和UA的氧化峰分开达0.188V。采用循环伏安法(CV法)和示差脉冲伏安法(DPVs法)同时测定DA和UA的线性范围分别为:DA:3.00×10^-6-4.00×100mol/L、4.00×10^-5~1.00×10^-4mlo/L(CV)、3.00×10^-7~3.00×10^-6mol/L、3.00×10^-6—1.00×10^-5mol/L(DPVs),UA:8.00×10^-6~5.00×10^-5mol/L、5.00×10^-5-2.00×10^-4mol/L(CV)、3.00×10^-7~5.00×10^-5mol/L、5.00×10^-5.2.00×10^-4mol/L(DPVs);检出限分另U为8.0×10^-7mol/L、1.0×10^-6mol/L(CV)和3.0×10^-7mol/L、3.0×10^-7mol/L(DPVs)。用于人体尿液中DA和UA的同时测定,结果满意。 相似文献
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Y. X. Chen X. J. Wan W. X. Xu * Shanghai University Shanghai China * Shanghai Iron Steel Research Institute Shanghai China 《中国有色金属学会会刊》1999,(Z1)
1 INTRODUCTIONRecentstudieshavedemonstratedthatanumberoforderedintermetallicscontainingreactiveelements,suchasAl,Ti,andSiaresusceptibletoenvironmentalembrittlementwhentestedinairatroomtemperature.Thisphenomenonisbelievedtobeahydrogenembrittlementp… 相似文献
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研究以Al2(SO4)3和NaAlO2为原料并流合成拟薄水铝石,经煅烧得到γ-Al2O3;分别考察了反应温度、反应液pH、反应物浓度和加入PEG对制备γ-Al2O3的比表面积、堆密度、孔容、孔分布的影响,采用X射线衍射、BET、压汞法等方法对γ-Al2O3进行了表征,制备出符合长链烷烃脱氢催化剂所用的介孔-大孔分布的活性氧化铝载体.表征结果显示,制备适宜介孔-大孔孔径分布的γ-Al2O3的较好条件为:反应液的pH为7、反应温度为70℃、NaAlO2的浓度为123 g/L、Al2(SO4)3的浓度为56 g/L 、反应时间为1 h、老化时间为2 h、700℃下煅烧. 相似文献
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利用R-1-苯基乙基异氰酸酯对β-环糊精键合固定相进行衍生,合成了R-1-苯基乙基氨基甲酸酯-β-环糊精手性固定相,填充后在反相条件下考察其对氢化安息香、安息香和α-苯乙醇的手性拆分,探讨了流动相中乙腈含量、缓冲盐类型等对手性拆分的影响。氢化安息香获得了基线分离,分离因子可达1.214,安息香得到了部分分离,α-苯乙醇未能拆开。结合线性溶剂强度(LSS)模型和计量置换理论(SDM-R)对色谱保留机理进行了探讨,认为水分子和乙腈分子一起参与了溶质的置换。 相似文献
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流化床固硫灰渣含有较高无水石膏和f-CaO,作为水泥混合材利用时会存在体积稳定性问题。在控制固硫灰渣掺量前提下,将固硫灰渣粉磨至不同细度,测试了掺加固硫灰渣的水泥标准稠度需水量、线性膨胀率和胶砂强度,并与普通硅酸盐水泥进行对比。结果表明,提高固硫灰渣细度,特别是固硫灰细度,能使水泥标准稠度需水量减少;固硫灰渣细度提高,水泥凝结时间有所延长;自然养护条件下,固硫灰渣细度变化对水泥收缩没有明显影响,潮湿养护下,磨细固硫灰渣早期能够释放较多膨胀,但处于可控范围;固硫灰渣细度增加,水泥强度明显提高。磨细有利于固硫灰渣作为水泥混合材利用。 相似文献