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赵燕春,毛瑞鹏,许丛郁,孙浩,蒋建龙,寇生中.Ti基非晶复合材料的强韧化机理研究[J].稀有金属材料与工程(英文),2019,48(6):1841~1846.[Zhao Yanchun,Mao Ruipeng,Xu Congyu,Sun Hao,Jiang Jianlong and Kou Shengzhong.Study on strengthening and toughening mechanism of Ti-based metallic glass composites[J].Rare Metal Materials and Engineering,2019,48(6):1841~1846.]
Study on strengthening and toughening mechanism of Ti-based metallic glass composites
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Received:February 19, 2018  Revised:May 05, 2018
Key words: metallic  glass composites, austenite, martensite, work  hardening
Foundation item:国家自然科学基金(51661017,51551101,51571105,51661016); 甘肃省杰出青年基金(17JR5RA108);
Author NameAffiliation
Zhao Yanchun,Mao Ruipeng,Xu Congyu,Sun Hao,Jiang Jianlong and Kou Shengzhong  
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      (Ti0.5Ni0.48M0.02)80Cu20 (M=Fe, Ce and Zr) with 3mm diameter was fabricated by suspend melting under argon atmosphere using a water-cooled Cu mold. The influences of Fe, Ce and Zr on the shape-memory crystalline phase precipitation law in the solidification structure of alloys were studied, and the mechanical behaviors at room temperature and strengthening and toughening mechanism of alloys analyzed as well. The results showed that the as-cast microstructure of (Ti0.5Ni0.48M0.02)80Cu20 (M=Fe, Ce and Zr) alloys are the amorphous matrix and shape-memory crystal phase (B2 undercooled austenite and B19’ thermal martensite) structure. The B2 phase volume fraction precipitates most in M=Fe alloy. In M=Zr alloy, the B19,phase volume fraction precipitates most. The alloys all exihibit good comprehensive mechanical properties, among which M=Ce alloy with the best comprehensive mechanical properties, and the fracture strength, yield strength and plastic strain are 2645Mpa, 1150Mpa and 12.2%, respectively. After alloys fracture with loading, the B2 austenitic phase volume fraction decrease and B19,martensite increase. Moreover, the room temperature deformation behavior of alloys can be described as elastic deformation and strong work hardening after yielding. The work hardening rate and instantaneous work hardening rate are divided into three stages with the change of true strain, and the transformation of B2 to B19" under the compressive stress is the mainly force of alloy strengthening and toughening. The work hardening rate, work hardening exponent and instantaneous work hardening index of the M=Fe alloy are the largest and its work hardening ability is the strongest, the work hardening ability of M=Ce alloy weaker than M=Fe alloy, and M= Zr alloy is the weakest.