Strengthening and toughening effects in laves phase Cr2Ta/Cr in-situ composites by Si additions

被引：11
|
作者：
Xue, Yunlong [1 ]
Li, Shuangming [2 ]
Wu, Yuanting [1 ]
Liu, Changqing [1 ]
Liu, Hulin [1 ]
Yuan, Liang [3 ]
机构：
[1] Shaanxi Univ Sci & Technol, Sch Mat Sci & Engn, Shaanxi Key Lab Green Preparat & Functionalizat I, Xian 710021, Peoples R China
[2] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[3] Shaanxi Univ Sci & Technol, Coll Bioresources Chem & Mat Engn, Xian 710021, Peoples R China
来源：
VACUUM | 2020年 / 174卷
基金：
中国国家自然科学基金;
关键词：
Laves phase; Microstructure; Mechanical properties; Toughening; MECHANICAL-PROPERTIES; PLASTIC-DEFORMATION; OXIDATION BEHAVIOR; ALLOYS; MICROSTRUCTURE; TRANSFORMATIONS; NIAL-CR(MO); CR-CR2TA; FRACTURE;
D O I：
10.1016/j.vacuum.2020.109202
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Three Cr-8Ta-xSi (x = 0, 6, 10) (at.%) alloys were fabricated by vacuum non-consumable arc melting in this study to investigate the microstructure evolutions and mechanical properties of the Si-modified Cr2Ta/Cr in-situ composites. The element Si was incorporated preferentially into Cr2Ta rather than phase Cr, thus the microstructure transited from the dendrite Cr plus the eutectic Cr2Ta/Cr in the Cr-8Ta alloy, to the full eutectic Cr2Ta/Cr in the Cr-8Ta-6Si alloy, and finally to the dendrite Cr2Ta plus the eutectic Cr2Ta/Cr in the Cr-8Ta-10Si alloy. The Cr-8Ta-6Si alloy was developed with a good combination of strength and toughness, and the yield strength and fracture toughness of this alloy reached up to 960 +/- 20 MPa and 15 +/- 0.3 MPa m(1/2), respectively. The good combination of strength and toughness in the Cr-8Ta-6Si alloy resulted from the synergistic effects of solid solution strengthening, alloying toughening, interface strengthening and second phase toughening.
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页数：6
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