论文部分内容阅读
在地壳中的金属元素中,钛元素含量仅次于镁(Mg)、铁(Fe)、铝(Al),排在第四位。钛合金材料以其轻质、比强度高、中低温性能好、耐腐蚀等优良的性能而成为倍受人们关注的材料。现已被广泛应用于航空、航天领域和其他民用领域,如汽车、体育器材等。Ti_6Al_4V以其优异的机械性能成为众多钛合金牌号中应用最广泛的一种钛合金材料,而基于Ti_6Al_4V的复合材料也成为倍受人们关注的焦点。TiB_2和TiC是最常见的两种颗粒增强剂,基于这两种颗粒增强的Ti_6Al_4V材料也被广泛的研究,但研究对象均为单相增强材料,且采用不同的制备工艺得到的复合材料性能差别比较大。从报道的结果看,通过TiB_2或TiC的加入,材料的抗拉强度、弹性模量都有了很大程度的提高。但在常温抗拉强度大于1200MPa的高强度钛合金材料中,其断后伸长率都降到了3%以下,这在很大程度上限制了材料的应用。在以前研究的基础上,采用TiB+TiC双相掺杂的方法对Ti_6Al_4V基复合材料进行了进一步的研究。
Among the metal elements in the crust, the content of titanium is second only to magnesium (Mg), iron (Fe) and aluminum (Al), ranking fourth. Titanium alloy material with its light weight, high strength, good performance at low temperature, corrosion resistance and other excellent performance has become a subject of much attention to the material. Has now been widely used in aviation, aerospace and other civilian areas, such as cars, sports equipment. Due to its excellent mechanical properties, Ti_6Al_4V has become the most widely used titanium alloy material among many titanium alloy grades, and the composite material based on Ti_6Al_4V has also become the focus of much attention. TiB_2 and TiC are the two most common particle-strengthening agents. Ti_6Al_4V materials based on these two kinds of particles are also widely studied, but the research objects are single-phase reinforcing materials, and the performance of composite materials obtained by different preparation processes is different bigger. From the results of the report, through the addition of TiB_2 or TiC, the tensile strength and elastic modulus of the material have been greatly improved. However, at room temperature tensile strength greater than 1200MPa high strength titanium alloy, the elongation after the break down to 3%, which largely limits the material application. On the basis of the previous studies, the Ti 6 Ti 4 Al 4 V matrix composites were further studied by means of TiB + TiC doping.