放电等离子烧结制备TC4/Ti_(n+1)AlC_n-TiAl叠层结构复合材料的组织和性能  

Microstructure and properties of TC4/Ti_(n+1)AlC_n-TiAl laminated composites prepared by spark plasma sintering

作　　者：费岩晗 艾桃桃[1] 袁新强[1] 冯小明[1] 

机构地区：[1]陕西理工大学材料科学与工程学院,陕西汉中723000

出　　处：《材料热处理学报》2017年第11期1-7,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金面上项目(51671116);陕西省自然科学基金重点项目(2016JZ016);陕西省教育厅重点实验室项目(16JS018);陕西省青年科技新星科技计划项目(2014KJXX-75);陕西理工大学科研计划项目(SLGQD16-04)

摘　　要：以TC4钛合金箔(Ti-6Al-4V)作为强韧层,TiC-Ti-Al混合粉末作为复合层,采用放电等离子烧结技术(SPS)制备TC4/Ti_(n+1)AlC_n-TiAl叠层结构复合材料(n=1或2)。研究了TC4/TiAl基叠层复合材料组成、结构和力学性能。结果表明:叠层之间结合良好,随着强韧层数量和Ti_(n+1)AlC_n含量的增加,界面层厚度减小,裂纹在扩展过程中Y型分叉角增大,应力集中因子减小,材料的力学性能显著提升。当强韧层数为9层时,材料的抗弯强度和断裂韧性在Arrester受力方向上达到最大值,分别为(1419.28±70.96)MPa和(62.17±3.11)MPa·m^(1/2)。TC4/Ti_（n＋1）AlC_n-TiAl（ n = 1 or 2） laminated composites were prepared by spark plasma sintering（ SPS） using TC4 titanium alloy sheets（ Ti-6 Al-4 V） as toughening layers and Ti C-Ti-Al mixed powders as composite layers. The composition,microstructure and mechanical properties of the TC4/Ti Al-based laminated composites were investigated. The results show that the bonding between the layers is well,and with the increase of the number of the toughening layer and the content of Tin ＋ 1 Al Cn,the thickness of the interface layers decreases,the Y-type bifurcation angle increases during the crack propagation,the stress concentration factor is weakened,and the mechanical properties of the composite materials are improved significantly. When the number of toughening layers is 9,the flexural strength and fracture toughness of the materials reach the maximum value in the stress direction of Arrester,which are（ 1419. 28 ± 70. 96）MPa and（ 62. 17 ± 3. 11） MPa·m^1/2,respectively.

关 键 词：TC4钛合金 TIAL基复合材料 叠层结构 TI2ALC 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]