通過粉末冶金和熱加工方法制備氧含量為0.42%～0.54%(質(zhì)量分數(shù))的Ti-Zr合金。結(jié)果表明:Ti-Zr合金由具有相同α相結(jié)構(gòu)的富Zr區(qū)和貧Zr區(qū)組成,富Zr區(qū)域的氧含量較高,且晶粒尺寸較小。Ti-Zr合金同時具有高強度(σ_s=700～900 MPa)和高的總伸長率(>20%),而氧的固溶強化是主要的強化機制。Zr由于與Ti具有高度結(jié)構(gòu)相似性,對氧誘發(fā)Ti合金脆化的影響不大。因此,0.54%(質(zhì)量分數(shù))的高含量值仍處于韌性到脆性轉(zhuǎn)變的臨界氧含量范圍內(nèi),不明顯降低材料的延展性。

【文章頁數(shù)】：10 頁

【文章目錄】：
1 Introduction
2 Experimental
    2.1 Materials preparation
    2.2 Mechanical tests
    2.3 Microstructural observation
    2.4 Oxygen measurements
3 Results
    3.1 Phase structures
    3.2 Microstructures
        3.2.1 As-sintered and as-rolled states
        3.2.2 Compositional analyses
        3.2.3 EBSD characterization
        3.2.4 Dislocation structures
    3.3 Mechanical behavior
    3.4 Fractography
4 Discussion
    4.1 Evolution of microstructures
    4.2 Effects of oxygen on strength and ductility
5 Conclusions



本文編號：3750012