大厚比Al/Mg/Al层合板的热轧工艺与性能

通过热轧工艺制备初始厚度比(单层镁初始厚度与单层铝初始厚度的比值)为5~40的Al/Mg/Al层合板。采用模拟和实验相结合的方法研究初始厚度比对Al/Mg/Al层合板的应力场、应变场、组织演变和性能的影响。结果表明,随着初始厚度比的增加,层合板的极限抗拉强度和屈服强度增加,界面结合强度和伸长率先增加后降低。当初始厚度比为20时,大厚比Al/Mg/Al层合板具有最佳的综合力学性能,界面结合强度(剥离强度)和伸长率达到最大值,其值分别为12.3 N/mm和23.32%。同时,从模拟和EBSD结果可以看出,当初始厚度比为20时,层合板的变形协调能力最好,铝侧织构转变为剪切织构。当初始厚度比达到40后,层压板的结合性能降低,镁合金的性能占主导地位。

铸态Ti-25V-15Cr-0.3Si钛合金静态再结晶过程中的二次相析出位置及显微组织演变（英文）

利用热压缩和热处理实验研究铸态Ti-25V-15Cr-0.3Si钛合金的显微组织演变和二次相析出位置。研究在不同热处理温度和时间下晶粒的平均长宽比、平均面积和尺寸,分析变形量和退火参数对晶粒面积和尺寸的影响。结果表明,晶粒尺寸受变形量和退火时间影响显著,在950°C、变形量为30%、当退火时间从10 min增加至2 h时,晶粒明显长大;而当退火时间为2~4 h时,晶粒长大缓慢。此外,还观察到大量弥散质点以连续的链状存在,显微组织观察和TEM衍射花样分析证实沿着原始晶界析出的弥散质点为Ti_5Si_3相。

A review of clinical and histological parameters associated with contralateral neck metastases in oral squamous cell carcinoma

Oral squamous cell carcinoma （OSCC） has a high incidence of cervical micrometastases and sometimes metastasizes contralaterally because of the rich lymphatic intercommunications relative to submucosal plexus of oral cavity that freely communicate across the midline, and it can facilitate the spread of neoplastic cells to any area of the neck consequently. Clinical and histopathologic factors continue to provide predictive information to contralateral neck metastases （CLNM） in OSCC, which determine prophylactic and adjuvant treatments for an individual patient. This review describes the predictive value of clinical-histopathologic factors, which relate to primary tumor and cervical lymph nodes, and surgical dissection and adjuvant treatments. In addition, the indications for elective contralateral neck dissection and adjuvant radiotherapy （aRT） and strategies for follow-up are offered, which is strongly focused by clinicians to prevent later CLNM and poor prognosis subsequently.

Controlling Roll Temperature by Fluid-Solid Coupled Heat Transfer

Currently, when magnesium alloy sheet is rolled, the method of controlling roll temperature is simple and inaccurate. Furthermore, roll temperature has a large influence on the quality of magnesium alloy sheet; therefore, a new model using circular fluid flow control roll temperature has been designed. A fluid heat transfer structure was designed, the heat transfer process model of the fluid heating roll was simplified, and the finite di erence method was used to cal?culate the heat transfer process. Fluent software was used to simulate the fluid?solid coupling heat transfer, and both the trend and regularity of the temperature field in the heat transfer process were identified. The results show that the heating e ciency was much higher than traditional heating methods(when the fluid heat of the roll and tempera?ture distribution of the roll surface was more uniform). Moreover, there was a bigger temperature di erence between the input and the output, and after using reverse flow the temperature di erence decreased. The axial and circum?ferential temperature distributions along the sheet were uniform. Both theoretical calculation results and numerical simulation results of the heat transfer between fluid and roll were compared. The error was 1.8%–12.3%, showing that the theoretical model can both forecast and regulate the temperature of the roll(for magnesium alloy sheets) in the rolling process.

Chemically induced large-gap quantum anomalous Hall insulator states in Ⅲ-Bi honeycombs

The search for novel materials with new functionalities and applications potential is continuing to intensify.Quantum anomalous Hall(QAH)effect was recently realized in magnetic topological insulators(TIs)but only at extremely low temperatures.Here,based on our first-principles electronic structure calculations,we predict that chemically functionalized Ⅲ-Bi honeycombs can support large-gap QAH insulating phases.Specifically,we show that functionalized AlBi and TlBi films harbor QAH insulator phases.GaBi and InBi are identified as semimetals with non-zero Chern number.Remarkably,TlBi exhibits a robust QAH phase with a band gap as large as 466 meV in a buckled honeycomb structure functionalized on one side.Furthermore,the electronic spectrum of a functionalized TlBi nanoribbon with zigzag edge is shown to possess only one chiral edge band crossing the Fermi level within the band gap.Our results suggest that Ⅲ-Bi honeycombs would provide a new platform for developing potential spintronics applications based on the QAH effect.