论文部分内容阅读
通过大量的实验而研制的混合添加剂，应用于高铝锌基合金上，可提高ZA合金塑韧性、强度、耐磨性。其中可提高ZA27合金塑性四倍以上，提高耐磨性一倍；可提高ZA12、ZA35的延伸率120－140％。利用扫描电镜、透射电镜、X射线衍射对混合添加剂的增性机理进行研究分析，结果表明：混合添加剂主要是通过改变ZA合金晶界共晶体的数量、分布、形态而起作用。另外，混合添加剂还可细化合金组织、净化晶界、减少显微缩松、底缩，从而进一步提高合金性能。通过正交实验所确定的低膨胀锌基合金──ZA35－C，加入混合添加剂后，成为高强度（σb＞430MPa）高塑性（6％＞10）高冲击韧性（αK＞50J／cm2）低膨胀（在20℃－150℃，α在19×10－6／℃左右）的新型锌基合金，其线膨胀系数比ZA27减少30％，与ZCuSn6Zn6Pb3相当，机械性能和耐磨性均优于国内所研制的同类合金，其耐磨性是ZCuSn6Zn6Pb3的十四倍，ZCuSn10P1的五倍，可作为耐磨材料、结构材料推广应用。
Through a large number of experiments and development of mixed additives, used in high-aluminum-zinc alloy, ZA alloy can improve the plastic toughness, strength, wear resistance. Which can improve the plasticity of ZA27 alloy more than four times, improve the wear resistance; can improve ZA12, ZA35 elongation of 120-140%. The enhancement mechanism of mixed additives was studied by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The results show that the mixed additive mainly works by changing the number, distribution and morphology of the eutectic grains in the grain boundary of ZA alloy. In addition, the mixed additives can refine the alloy structure, clean the grain boundaries, reduce micro-shrinkage, bottom shrinkage, thereby further improving the performance of the alloy. High tensile strength (σb> 430MPa) High plasticity (6%> 10) High impact toughness (αK> 50J / cm2) Low added ZA35-C by orthogonal experiment The new zinc-based alloys with expansion (at 20 ℃ -150 ℃ and α at 19 × 10-6 / ℃) have a linear expansion coefficient of 30% less than that of ZA27, which is equivalent to that of ZCuSn6Zn6Pb3, and their mechanical properties and wear resistance are better than those of domestic The developed alloy, its wear resistance is 14 times ZCuSn6Zn6Pb3, ZCuSn10P1 five times, can be used as wear-resistant materials, structural materials to promote the use of.