岩石组构是指组成岩石的矿物在岩石中分布的各向异性，EBSD （Electron Back Scattered Diffraction）岩组分析就是运用电子背散射衍射技术测定岩石结构要素---岩石中矿物分布的规律性。本文作者运用EBSD技术方法，对阿尔金山喀腊大湾...岩石组构是指组成岩石的矿物在岩石中分布的各向异性，EBSD （Electron Back Scattered Diffraction）岩组分析就是运用电子背散射衍射技术测定岩石结构要素---岩石中矿物分布的规律性。本文作者运用EBSD技术方法，对阿尔金山喀腊大湾地区变形岩石的组构分析显示，花岗质糜棱岩和蚀变变形花岗岩中，石英变形机制是以中温I级柱面（10-10）＜0001＞和中高温II 级柱面（10-10）＜0001＞滑移为主，少量为中低温底面（0001）＜11-20＞滑移；而在变形火山岩中，石英变形机制是以中低温底面（0001）＜11-20＞滑移系为主。在区域南北向剖面分布上，接近阿尔金北缘断裂和白尖山断裂的中北部变形温度较高，向南变形温度有逐渐降低的趋势。从岩石组构特点结合宏观构造分析，可以认为本区北段属于中-中深层次（15～25km，t＝350～550℃，P＝0．40～0．60GPa）的韧性变形，而中南段为中浅层次（10～15km，t＝250～350℃，P＝0．25～0．40GPa）的韧脆性变形。结合不同变形特点花岗岩的年代学资料，确定构造变形的时代为早古生代。上述特征与区域上发育板块碰撞带，且北部发育高压榴辉岩和蓝片岩的构造部位以及该构造变形带的演化历史相吻合。展开更多
Using a Gleeble 1500 hot simulator, the dynamic recrystallization （DRX） behavior of Mn-Cr type gear steel was investigated. The experimental results show that the Mn-Cr gear steel exhibits a typical DRX behavior at ...Using a Gleeble 1500 hot simulator, the dynamic recrystallization （DRX） behavior of Mn-Cr type gear steel was investigated. The experimental results show that the Mn-Cr gear steel exhibits a typical DRX behavior at higher deformation temperature, lower strain rate and smaller initial austenite grain size. The DRX takes place under the conditions that Zener-Hollomon parameter （Z） is less than a critical value Zc. The DXR grains are formed by the bulging mechanism. Activation energy and stress exponent were calculated to be 378.6 kJ · mol^-1 and 5.8 respectively by regression analysis.展开更多
文摘Using a Gleeble 1500 hot simulator, the dynamic recrystallization （DRX） behavior of Mn-Cr type gear steel was investigated. The experimental results show that the Mn-Cr gear steel exhibits a typical DRX behavior at higher deformation temperature, lower strain rate and smaller initial austenite grain size. The DRX takes place under the conditions that Zener-Hollomon parameter （Z） is less than a critical value Zc. The DXR grains are formed by the bulging mechanism. Activation energy and stress exponent were calculated to be 378.6 kJ · mol^-1 and 5.8 respectively by regression analysis.
