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Effect of thermo-mechanical treatment process on microstructure and mechanical properties of 2A97 Al-Li alloy 被引量:11
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作者 高崇 栾阳 +1 位作者 于俊川 马岳 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第7期2196-2202,共7页
2A97 Al-Li alloy was processed by thermo-mechanical treatment at different pre-stretch deformations of 0, 3% and 6%. The microstrucatre observation results reveal that some δ' and T1 precipitates are found in a(Al... 2A97 Al-Li alloy was processed by thermo-mechanical treatment at different pre-stretch deformations of 0, 3% and 6%. The microstrucatre observation results reveal that some δ' and T1 precipitates are found in a(Al) matrix of 2A97 alloy processed by the heat treatment with no pre-stretch deformation. When the pre-stretch deformation is 3% and 6%, respectively, amounts of tiny T1 and a few of S' precipitates precipitates are observed in the microstructures of 2A97 alloy. The tensile test results show that the tensile properties of 2A97 alloys are improved via thermo-mechanical treatment. When the pre-stretch deformation is from 0, 3% to 6%, the ultimate tensile strength values of the 2A97 alloys increase gradually from 447.7, 516.5 to 534.3 MPa, and the elongations decrease from 17.6%, 12.8% to 10.2%, respectively. Moreover, with increasing pre-stretch deformation amount from 0 to 6%, the in-plane anisotropy value of 2A97 alloys becomes more obvious. 展开更多
关键词 2a97 Al-Li alloy thermo-mechanical treatment pre-stretch deformation microstructure mechanical properties
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Fatigue crack initiation and early propagation behavior of 2A97 Al-Li alloy 被引量:6
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作者 钟警 钟申 +2 位作者 郑子樵 张海锋 罗先甫 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第2期303-309,共7页
The fatigue crack initiation and early propagation behavior of 2A97 Al-Li alloy was studied. The smooth specimens were fatigued at room temperature under constant maximum stress control when stress ratio (R) is 0.1 ... The fatigue crack initiation and early propagation behavior of 2A97 Al-Li alloy was studied. The smooth specimens were fatigued at room temperature under constant maximum stress control when stress ratio (R) is 0.1 and frequency (f) is 40 Hz. Microstructure observations were examined by optical microscopy, transmission electron microscopy, scanning electron microscopy and electron back scattered diffusion, in order to investigate the relationship between microstructure and fatigue crack initiation and early propagation behavior of 2A97 alloy. The results show that the fatigue cracks are predominantly initiated at inclusions and coarsen secondary phases on the surface of 2A97 alloy. The fatigue crack early propagation behavior of 2A97 alloy is predominantly influenced by the interactions between grain structure and dislocations or persistent slip bands (PSBs). When the misorientation of two neighbouring grains is close to the orientations of the favorable slip plane within these two grains, high-angle grain boundary severely hinders the PSBs passing through, and thus leads to crack bifurcation and deflection. 展开更多
关键词 2a97 Al-Li alloy fatigue crack initiation fatigue crack early propagation
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