Mechanical properties of Ti-(Al3Ti+Al) and Ti-Al3Ti laminated composites
Mechanical properties of Ti-(Al3Ti+Al) and Ti-Al3Ti laminated composites
复制标题
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
M. Konieczny
中科院分区：
文献类型：
--
作者：
M. Konieczny
采用50、100和150 μm厚的钛和50 μm厚的铝箔，在控制温度和处理时间的条件下合成了Ti-(Al3Ti+Al)和Ti-Al3Ti复合材料。显微组织分析表明，Al3Ti是Ti和Al反应过程中唯一形成的相。在650℃下处理20分钟后，并不是所有的铝都被消耗掉了，复合材料由Ti、Al和Al3Ti交替层组成。60分钟后，铝层完全消耗，形成Ti残余层与Al3Ti层交替的微观结构。对不同微观组织的材料进行了拉伸强度、弯曲强度和冲击韧性测试，以确定材料的性能和断裂行为。处理60 min后的复合材料的屈服强度、极限抗拉强度和抗弯强度均高于处理20 min后相同厚度的复合材料。另一方面，复合材料的断裂应变和冲击韧性表现相反。研究结果表明，复合材料的力学性能很大程度上取决于单个Ti层的厚度和金属间质心线上残余Al层的存在。
Laminated Ti-(Al3Ti+Al) and Ti-Al3Ti composites have been synthesised with controlled temperature and treating time using 50, 100 and 150 μm thick titanium and 50 μm thick aluminium foils. Microstructural examinations showed that Al3Ti was the only phase formed during the reaction between Ti and Al. After 20 minutes of treating at 650°C, not all the aluminium was consumed and the composites consisted of alternating layers of Ti, Al and Al3Ti. After 60 minutes, the aluminium layers were completely consumed, resulting in microstructures with Ti residual layers alternating with the Al3Ti layers. Tensile strength, flexural strength and impact toughness measurements were performed on the materials with different microstructures to establish the properties and fracture behaviour. After 60 minutes of treating, all the composites had a higher yield strength, higher ultimate tensile strength and higher flexural strength than those composites after 20 minutes of treating produced with the same thickness of starting Ti foil. On the other hand, the strain at fracture and impact toughness of the composites behaved conversely. The results of the investigations indicated that the mechanical properties of the composites strongly depend on the thickness of the individual Ti layers and the presence of residual Al layers at the intermetallic centrelines.