文章信息/Info

Title:

Strengthening and Toughening Mechanisms of the Second Phase in Titanium Alloys and Titanium Matrix Composites

作者:

黃陸軍1; 2; 耿 林1; 2; 彭華新3

（1.哈爾濱工業大學 先進焊接與連接國家重點實驗室，黑龍江 哈爾濱 150001）

（2.哈爾濱工業大學材料科學與工程學院，黑龍江 哈爾濱 150001）

（3.浙江大學材料科學與工程學院 功能復合材料與結構研究所，浙江 杭州310027）

Author(s):

HUANG Lujun1;  2;  GENG Lin1;  2;  PENG Huaxin3

(1.State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China)
(2.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
(3.Institute of Composites Science Innovation, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China)

關鍵詞:

鈦合金; 鈦基復合材料; 第二相; 強韌化; 力學性能; 組織結構

Keywords:

titanium alloys; titanium matrix composites; the second phase; toughening effect; mechanical property; microstructure

DOI:

10.7502/j.issn.1674-3962.2019.03.03

文獻標志碼:

A

摘要:

鈦合金因具有比強度高、抗腐蝕性優兩大突出優點，在航空、航天、航海、交通運輸等領域具有廣泛的應用，為進一步提高其耐熱溫度、彈性模量、耐磨性、強度以擴大應用范圍，采用合金化、復合化引入第二相來實現強化目的。合金化可以實現固溶強化、納米第二相強化及其帶來的組織細化強韌化，通過變形還可以實現位錯強化。復合化可以在鈦合金中引入微米增強相，有效提高強化效果，但塑性大幅降低，通過調控增強相分布設計則可以有效解決塑性大幅降低的問題。如單一級準連續網狀結構、兩級網狀�簿W狀結構、兩級層狀-網狀結構都表現出優異的室溫與高溫綜合性能，在航空航天等領域具有廣泛的應用前景，對飛行器減重設計提供重要支撐。鈦合金與鈦基復合材料力學性能的大幅提升將依賴于多級結構與多尺度增強相的設計與優化，與其相關的理論計算、數值模擬、高通量制備、強韌化機理、適用于多級多尺度結構的新理論、成形技術與應用將是研究重點。

Abstract:

Titanium alloys have extensively used in the fields of aerospace, sailing, transportation et al. due to their high specific strength and corrosion resistance. To further enhance their high temperature durability, modulus, wear resistance and strength for more application, the secondary phase was introduced into titanium alloys by alloying and composite methods. The alloying method can generate solid solution strengthening effect, the secondary phase strengthening effect and grain refinement toughening effect. In addition, dislocation strengthening effect can be obtained by deformation. The composite method can effectively enhance the strength but sacrifice their ductility by introducing micro-scale reinforcement. It is fortunate to find that the problem of the composite low ductility can be solved by tailoring reinforcement distribution. The prepared composites with quasi-continuous single network microstructure, two-scale network-network microstructure or laminate-network microstructure exhibited superior mechanical properties at both room temperature and high temperatures. Therefore, the composites can effectively support weight loss design of aerocraft, which will attract extensive application prospects in the fields of aerospace et al. The mechanical properties of titanium alloys and titanium matrix composites will be remarkably enhanced based on multi-scale hierarchical microstructure design and optimization. The corresponding theory calculation, numerical simulation, high-flux fabrication technology, toughening mechanisms, the forming technique and application will be the next research points.