浅谈日本胶合板热压机

浅谈日本胶合板热压机从日本进口的胶合板生产设备中，热压机、装卸板机具有结构设计合理、动作可靠、故障率低等优点。下面仅就我厂引进日本生产的热压机谈几点看法。１机架部分：该机机架采用焊接式整体结构，用厚１２ｍｍ的普通钢板在上下横梁处呈蜂窝状焊接。安装油缸...     

Corrosion resistance of cerium conversion film electrodeposited on Mg-Gd-Y-Zr magnesium alloy

The cerium conversion film was applied to improving the corrosion resistance of Mg-Gd-Y-Zr magnesium alloy. The film was electrodeposited on the surface of the Mg-RE alloy in cerium nitrate solution. The compositions and morphologies were analyzed by X-ray diffraction(XRD), scanning election microscopy (SEM). The corrosion behaviors of the film were investigated electrochemical impedance spectroscopy (EIS), potentiodynamic polarization tests and immersion tests. The results show that the optimum parameters for electrochemical deposition are as follows: pH 10.0, time 30 min, 50 mmol/L Na₂CO₃ and temperature 25 °C by the designed experiments according to the orthogonal table L(9, 3⁴). The corrosion protection efficiency is dependent on the deposition parameters. The cerium conversion film shows better corrosion protection behavior than chromate conversion film on Mg-Gd-Y-Zr magnesium alloy. Foundation item: Project (5133001E) supported by the Major State Basic Research and Development Program of China     

微量Zr对Al-5.8Cu-0.3Mn合金焊接接头组织与性能的影响

采用4047焊丝对Al-5．8Cu-0．3Mn铝合金进行熔化极惰性气体保护焊，利用金相显微镜、透射电镜、显微硬度等检测分析手段研究了Zr对Al-5．8Cu-0．3Mn母材及焊接接头的力学性能和显微组织的影响。结果表明，Al-5．8Cu-0．3Mn合金中添加适量Zr元素可使母材强度提高30MPa，焊接接头强度提高50MPa，同时，细化了母材的再结晶组织和焊缝组织。焊接接头的强度低于母材强度，焊缝区是合金的薄弱处，热影响区强度降低是θ‘相粒子受热粗化所致。     

Effect of Zr content on quench sensitivity of AlZnMgCu alloys

The effect of Zr content on quench sensitivity of AlZnMgCu alloys was investigated by mechanical properties testing and microstructure observations. The results show that with the increase of Zr the quench sensitivity relative to hardness and strength increases, while that relative to elongation decreases. From hardness and strength viewpoints, the low quench sensitivity is observed for the Zr-free and 0.05% Zr-containing alloys, which is quite quench sensitive from the ductility viewpoint. The largest quench sensitivity relative to hardness and strength is observed for 0.1% Zr-containing alloy, this is mainly due to large amount of high angle grain boundaries and incoherent Al3Zr dispersoids caused by recrystallization, which may efficiently promote heterogeneous precipitation during air quenching. More than 0.05% Zr can significantly decrease the quench sensitivity relative to ductility, which can be primarily attributed to recrystallization inhibiting and grain refining effects of Zr.     

铝合金板材弯曲成形性能

以5083铝合金板材的V形弯曲为研究对象,探究了影响板材回弹的几种因素.结果表明:5083铝合金板材的屈服强度越大其回弹角也越大;随着弯曲角的增加,回弹角减小;弯曲模具开口度增加,回弹角减小;相对弯曲半径增加,回弹角增加;V形弯曲部分的板材会减薄,对于相同的弯曲角,相同型号的试样,弯曲半径越小,则弯曲减薄量越大;而使用相同尺寸的弯曲半径时,弯曲角度越大则减薄量越大.     

微量Mg和Ag在Al-5.8Cu-0.3Mn合金中的合金化作用

通过力学性能测试和显微组织观察研究了Al-5．8Cu-0．3Mn合金中微量Mg和Ag的合金化作用。结果表明,单独添加Ag和单独添加Mg均使合金θ′相的析出速度加快,析出的密度增加,合金的强化效果增强,但Mg的单独作用比Ag大;Mg和Ag共同加入产生的强化效应最大,这是由于Mg和Ag强烈相互作用在合金中析出Ω相强化所致。     

非平底凹模复合成型中板料成型有限元分析

金属板料与塑料复合成型中采用非平底凹模结构制造复杂轮廓形状的复合零件时，金属板料的轮廓形状受到金属板料成型极限的限制，作者用复合成型试验和弹塑性大变形有限元方法揭示了表面轮廓形状较复杂的结构零件复合成型中金属板料的成型过程，变形板料划分为6个区域；凸缘区（Ⅰ区），模腔入口圆角区（Ⅱ区），与模底接触区1（Ⅲ区），模底圆角过渡区（Ⅳ区），与模底接触区2（Ⅴ区），及Ⅱ区与Ⅴ区之间的自由变形区（Ⅵ区）。研究结果表明：Ⅰ区与Ⅱ区处于拉伸变形状态，Ⅲ区处于板面内双向伸长变形状态；由于模具轮廓形状的急剧变化以及小圆角半径的影响，Ⅳ区内剪切和弯曲作用强，并形成一个板厚大大减薄的大塑性变形区；当熔体区压力超过28MPa时，板料的变形主要集中在Ⅵ区，并在Ⅵ区与Ⅱ区和Ⅵ区和Ⅴ区变界上形成2个板厚减薄较严重的大塑性变形区。     

Al-12.6%Si薄带双辊快速凝固成形试验研究

运用双辊快速凝固方法将液态Ａｌ－１２．６％Ｓｉ合金直接制备成厚度为０．１￣０．５ｍｍ的薄带。介绍了这一方法的基本原理、特点和试验设备设计中的关键问题。辊面可控线速度Ｖｒ为２￣８．５ｍ／ｓ,薄带厚度正比于Ｖｒ＾－１／２。薄带组织为细小的初晶α－Ａｌ和极细小的（α－Ａｌ＋Ｓｉ）共晶体,塑性和抗拉强度得到明显改善．     

双辊快速凝固制备颗粒增强铝基复合材料的新途径

为了制备基体晶粒细小、增强颗粒分布均匀且与基体结合良好、界面上无明显反应产物的颗粒增强铝基复合材料，在铝及铝合金双辊快速凝固技术研究的基础上，提出了同步喷射增强颗粒和结合熔体接触反应法的两种双辊快速凝固制备方法，介绍了这两种方法制备颗粒增强铝基复合材料的思路，阐述了制备的复合材料的潜在特点。     

颗粒增强金属基复合材料的快速凝固制备方法及其特点

简述了几种主要的非快速凝固方法制备颗粒增强金属基复合材料所存在的主要问题，介绍了这种材料的快速凝固制备工艺方法，研究的概况及其特点。