摘要
采用机械合金化结合粉末冶金技术制备了Ti-44.7Al-xW(at%)合金材料。采用透射电镜、扫描电镜和金相显微镜研究不同W添加量对机械合金化TiAl基合金的显微组织和高温抗氧化性能的影响,并对合金的力学性能进行测试。研究表明,通过机械合金化在TiAl基合金系统中添加微量W元素会形成新的固溶体相,这种新成分相大大提高TiAl基合金的抗弯强度σ_b。当W添加量为1.0at%时,σ_b达到峰值:随后随着W含量的增加,抗弯强度降低。W元素的添加有效的制约了合金基体的内部氧化,使TiAl合金的高温抗氧化性能明显提高。
Ti-44.7Al-xW（at%） alloys were prepared by mechanical alloying with subsequent traditional powder metallurgy technique. Effect of the different W contents on microstructure, high temperature oxidation property of Ti-44.7Al-xW alloy were investigated by using transmission electron microscopy, scanning electron microscopy and metallographic microscope, and the mechanical property of alloy was measured. The results show that in the system of Ti-Al alloy new solid solution phases were formed because of the tungsten addition. Meantime, the bending strength of TiAl matrix alloy is reinforced by the new phases. The value of the bending strength peaks when 1.0at% W addition, and later decreased with the increase in W content. The improvement of high temperature oxidation resistance of TiAl alloy was mainly attributed to that the formation of continuous and dense Al2O3 layer on the surface which inhibit the internal oxidation of the matrix alloy.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2007年第B08期58-61,75,共5页
Transactions of Materials and Heat Treatment
基金
安徽省自然科学基金(050440704)
合肥工业大学科技创新基金(103-037016)
