1. 毕业设计（论文）的内容和要求

钛及钛合金具有高比强度、低弹性模量、强耐腐蚀性、低膨胀系数、低热导率以及环境友好等优势，经常被用于航空航天、生物医疗以及海洋船舶等领域。

ti-6al-4v合金凭借其良好的综合力学性能，目前仍是世界范围内使用最为广泛的钛合金材料（约占钛材消费量的50%）。

但ti-6al-4v合金也拥有诸多缺点，合金的抗拉强度相对较低，难以胜任高强度构件的要求；同时合金高温塑性变形加工时所受流变抗力较大，热加工性能较差。

2. 参考文献

1.Peng X, Guo H, Wang T, et al. Effects of β treatments on microstructures and mechanical properties of TC4-DT titanium alloy[J]. Materials Science Engineering A, 2012, 533:55-63. 2.Guo P, Zhao Y, Zeng W, et al. The effect of microstructure on the mechanical properties of TC4-DT titanium alloys[J]. Materials Science Engineering A, 2013, 563(2):106-111. 3.Zhang S Z, Xu H Z, Li G P, et al. Effect of carbon and aging treatment on precipitation of ordered α 2, in Ti#8211;5.6Al#8211;4.8Sn#8211;2Zr#8211;1Mo#8211;0.35Si#8211;0.7Nd alloy[J]. Materials Science Engineering A, 2005, 408(1):290-296. 4.Qin D Y, Lu Y F, Guo D Z, et al. On preparation of bimodal Ti#8211;5Al#8211;5V#8211;5Mo#8211;3Cr#8211;0.4Si (Ti-5553s) alloy: α β forging and heat treatment[J]. Materials Science Engineering A, 2014, 609:42-52. 5.Liu C M, Wang H M, Tian X J, et al. Development of a pre-heat treatment for obtaining discontinuous grain boundary α in laser melting deposited Ti-5Al-5Mo-5V-1Cr-1Fe alloy[J]. Materials Science Engineering A, 2014, 604(604):176-182. 6.Hiroaki Matsumoto, Hiroshi Yoneda, Kazuhisa Sato, et al. Room-temperature ductility of Ti#8211;6Al#8211;4V alloy with α′ martensite microstructure[J]. Materials Science Engineering A, 2011, 528(3):1512-1520. 7.Wang K, Li M Q. Effects of heat treatment and hot deformation on the secondary α phase evolution of TC8 titanium alloy[J]. Materials Science Engineering A, 2014, 613:209-216. 8.Du Z X, Xiao S L, Shen Y P, et al. Effect of hot rolling and heat treatment on microstructure and tensile properties of high strength beta titanium alloy sheets[J]. Materials Science Engineering A, 2015, 631:67-74. 9.Zhang S, Li J, Kou H, et al. Effects of thermal history on the microstructure evolution of Ti-6Al-4V during solidification[J]. Journal of Materials Processing Technology, 2015, 227. 10.Vrancken B, Thijs L, Kruth J P, et al. Heat treatment of Ti6Al4V produced by Selective Laser Melting: Microstructure and Mechanical properties[J]. Journal of Alloys Compounds, 2012, 541(22):177-185. 11.Zherebtsov S V, Murzinova M A, Klimova M V, et al. Microstructure evolution during warm working of Ti#8211;5Al#8211;5Mo#8211;5V#8211;1Cr#8211;1Fe at 600 and 800 #176;C[J]. Materials Science Engineering A, 2013, 563:168-176. 12.Zhao H J, Wang B Y, Liu G, et al. Effect of vacuum annealing on microstructure and mechanical properties of TA15 titanium alloy sheets[J]. Transactions of Nonferrous Metals Society of China, 2015, 25(6):1881-1888. 13.Xu J, Zeng W, Sun X, et al. Microstructure evolution during isothermal forging and subsequent heat treatment of Ti-17 alloy with a lamellar colony structure[J]. Journal of Alloys Compounds, 2015, 637:449-455. 14.Ji Z, Yang H, Li H. Evolution of Two Types of α Plates in Tri-modal Microstru-cture of TA15 Alloy under Varying Processing Conditions[J]. Rare Metal Materials Engineering, 2015, 44(3):527-531. 15.黄德明, 梁盛隆, 唐静,等. 不同热处理制度下TC4合金棒材的组织与性能[J]. 钢铁钒钛, 2014, 35(5):25-30. 16.邵晖, 赵永庆, 葛鹏,等. 不同组织类型对TC21合金强-塑性的影响[J]. 稀有金属材料与工程, 2013, 42(4):845-848. 17.祝力伟, 王新南, 朱知寿. 不同热处理工艺下TC4-DT钛合金的显微组织及力学性能[J]. 钛工业进展, 2012, 29(1):9-12.

3. 毕业设计（论文）进程安排

2016.12.21~2017.1.4 查阅中外文资料，翻译外文资料，参加讨论 2017.1.4~2017.1.18 撰写开题报告，参加开题答辩 2017.2.13~2017.3.16 制定研究方案，熟悉仪器，参加讨论 2017.3.17~2017.4.18 前期的实验研究，结果分析，参加讨论 2017.4.19~2017.4.30 撰写中期报告，参加中期检查答辩 2017.5.1~2017.5.20 后期的实验研究，结果分析，补充计算，参加讨论 2017.5.21~2017.6.13 整理数据，撰写论文，准备答辩，参加毕业论文答辩