摘要：γ-TiAl基合金在高温抗蠕变，抗氧化方面性能优异，同时在高温时其强度较高。又因γ-TiAl基合金的密度较低，所以其比强度较高。这些一系列优点都十分符合航空航天领域对材料的要求，γ-TiAl基合金在航空航天领域和汽车工业领域拥有较大发展潜力。但是γ-TiAl基合金室温大多晶粒粗大，晶界特征分布较差且特殊晶界较少，这导致了其室温脆性和室温变形加工能力差的致命缺点，极大地限制了它的工业应用。本文利用热处理工艺，致力于通过多组不同工艺参数的热处理工艺来细化晶粒，找出不同热处理工艺参数与晶粒大小之间的关系，同时通过热处理来优化晶界特征分布，找出影响晶界特征分布的因素和它们之间的关系。通过EBSD和XRD等来观测结果，找到热处理工艺与晶粒大小和晶界特征分布之间的关系，找到最佳的工艺参数从而使晶粒得到细化，晶界特征分布得到优化来改善γ-TiAl基合金室性能，促进γ-TiAl基合金的工业应用。
关键词：γ-TiAl基合金，退火工艺，优化晶界特征分布，细化晶粒
毕业设计学术论文外文摘要
Title Study on Gr ain - Bound Engineering of γ-TiAl based Alloy by Heat Treatment
Abstract：γ-TiAl based alloys have good high temperature properties, such as excellent high temperature creep resistance, oxidation resistance, and high temperature strength, coupled with its low density, higher than the strength of a series of properties, making γ-TiAl alloy in the field of aerospace and automotive industry has a greater development potential. However, most of the γ-TiAl based alloys have large grain , poor grain boundary distribution and less special grain boundary, which leads to the fatal defects of room temperature brittleness and room temperature deformation, which greatly limits its industrial application. In this paper, the annealing process is used to refine the grain.Bying multiple sets of samples which have several different annealing process parameters to optimize the grain boundary distribution. The results were observed by EBSD and XRD. The relationship between the annealing process and grain size and grain boundary distribution was found. The optimum process parameters were found to refine the grain and the grain boundary distribution was optimized to improve the properties of γ-TiAl based Alloys and promote it,s industrial application .
Keywords：γ-TiAl alloys, Annealing process , Optimize grain boundary feature distribution, Refine the grain
目 录
1绪论 3
1.1研究背景 3
1.2研究内容 3
1.3Ti-Al基合金的概述 4
1.3.1Ti-Al基合金应用背景 4
1.3.2Ti-Al基合金组织结构 5
1.3.3Ti-Al基合金显微组织对性能的影响 6
1.3.4Ti-Al基合金室温性能 7
1.3.5单相γ-TiAl基合金 8
1.4多晶体晶界工程 8
1.5热处理工艺 10
1.5.1回复再结晶退火 10
1.5.2直接热处理 10
1.5.3循环热处理 11
2研究方法 11
2.1实验方案 11
2.2实验材料和仪器 热处理对γ-TiAl基合金的晶界工程研究:http://www.chuibin.com/cailiao/lunwen_205296.html