Growth of AgGaS2 single crystal by descending crucible with rotation method and observation of properties

This note reports a new procedure of polycrystalline synthesis and a new technique of single crystal growth on AgGaS₂, i.e. two-zone temperature oscillation vapor transporting and descending crucible with rotation. A single phase dense AgGaS₂ polycrystalline ingot was synthesized, and a crack-free AgGaS₂ single crystal with 15 mm in diameter and 30 mm in length was grown by the techniques mentioned above. Structure integrity of the crystal was studied by the X-ray diffraction technique. Six order X-ray spectra from the 011 face of the crystal were obtained, and an anomalous phenomenon was observed for the first time that intensity of the higher order diffraction peak is much stronger than that of the lower order diffraction peak. Etch-pits of the crystal were observed by the scanning electron microscopy (SEM).     

齿轮线接触疲劳的模拟性研究——试样的正确设计与点蚀的力学成因

用光弹性应力分析,论证了美国卡特皮勒拖拉机公司的齿轮类线接触疲劳试样具有可靠的线接触模拟性;证明了用静应力场分析动载下接触疲劳裂纹形成与扩展的可靠性;并运用应力分布状况分析了裂纹可能的形成位置和扩展方向;揭示了应力状态与各种点蚀形貌及形成之间的关系,从而证明点蚀的形成及形貌是由表层应力状态决定的。     

Ly12铝合金化铣蚀坑形成机理

研究了淬火转移时间与８ｍｍ厚Ｌｙ１２铝合金板化铣蚀坑出现的关系。发现瞬间淬火时，合金化铣不产生蚀坑；淬火转移时间稍长时，合金化铣将产生蚀坑。合金出现蚀坑时，微观组织上沿晶界有第二相析出。第二相沿晶界析出导致晶界抗腐蚀性能降低，是引起合金化铣时产生蚀坑的基本原因。