为充分利用超细贝氏体钢的TRIP效应，使其抗拉强度在≧1500 MPa的同时，强塑积≧30GPa％，本文以Fe-0.6C-2.5Si-0.45Mn-0.78Al和Fe-0.8C-2.5Si-0.45Mn-0.78Al钢为研究对象，研究了奥氏体晶粒尺寸对超细贝氏体钢薄膜状残余奥氏体形成及力学性能的影响.结果表明，实验钢中薄膜状残余奥氏体的形成与奥氏体晶粒尺寸有关.当Fe-0.6C-2.5Si-0.4
一般材料的模量会随温度的增加而降低,但相变会导致模量的异常软化,使得其模量与温度的关系表现为dE/dT＞0.正常材料的dE/dT＜0的温度范围是整个温度区间,而dE/dT＞0对应的温度区间则比较狭窄,结合目前的模量软化结果,发现单一的结构相变或磁性相变或有序化相变,其dE/dT＞0对应的温度区间均不超过50K,当相变结束时,其模量变化特征又呈现正常的dE/dT＜0.这种狭窄的区域使得其实际应用价值
Recently,a giant strain of 0.45％was observed in 92(Bi1/2Na1/2)TiO3-6BaTiO3-2(K,Na)NbO3(BNT-BT-2KNN)(with 2 mol％KNN)incipient piezoceramic at room temperature,which is higher than the strain of a comme
β钛合金(体心立方结构)冷加工后产生多种物相，如{112}孪晶、ω相(非密排六方结构)，在电子衍射时，多种物相或晶体一起参与，使得衍射花样变复杂。单晶电子衍射花样可以查阅标准电子衍射花样快速标定，而多种晶体产生的复合衍射花样没有所谓的"标准花样"。为此，我们可以在各相(材料中可能的几个相或孪晶)之间建立位向关联，使晶面、晶向指数在不同晶体坐标中可以互相转换，结合衍射规律，我们就能绘制出这种标准的复
利用分子动力学方法,模拟包含不同取向{10(-12)}＜10(-1)(-1)＞孪晶界的纳米孪晶镁的单轴拉伸与单轴压缩行为.通过使加载方向与孪晶界呈不同角度,研究不同取向下不同的变形机制.由此揭示了在含有孪晶界的纳米孪晶中不同取向{10(-12)}＜10(-11)＞纳米孪晶镁在单轴荷载下的变形机制.
A narrow linewidth 1908nm Tm:YLF laser was established based on a Volume Bragg Grating(VBG) as the reflection mirror,the maximum output power of 15.53W when the incident pump power of 48.2W was obtain
Nd:YAG laser as the most commonly used solid-state laser light source,can realize CW and pulse operation at room temperature in a variety of ways,but for the working materials,laser transparent polycr
To obtain high single pulse energy and high beam quality second harmonic generation,a double-arched LDA stagger pumped electro-optic Q-switched Nd:YAG with a convex-concave compensate resonator system
A diode-pumped acousto-optic(AO)Q-switched master oscillator power amplifier (MOPA) all-solid-state laser with high repetition rate and high pulse energy is demonstrated by using a master oscillator p
High contrast grating (HCG) is a subwavelength nanostructure which can supply high reflectance and wide reflectivity bandwidth.