Abbreviation (ISO4): Journal of Materials Engineering
Editor in chief: Xiangbao CHEN
Journal of Materials Engineering >
Effect of solid solution temperature on microstructure and properties of 2050 Al-Li alloy extruded bars
Received date: 2022-08-29
Revised date: 2023-05-16
Online published: 2024-03-10
Under certain solid solution time conditions, the solid solution temperature determines the degree of supersaturation and recrystallisation of the matrix after quenching, and is an important factor in enhancing the performance of the material after aging treatment. Through the solid solution heat treatment of 2050 Al-Li alloy extruded bar at different temperatures for 2 h and artificial aging treatment at 170 ℃ for 40 h, combined with a variety of property testing methods and microstructure observation methods, the effect of solid solution temperature on the microstructure and properties of 2050 Al-Li alloy extruded bar was studied. The results show that the residual phase is continuously redissolved with the increase of the solid solution temperature, and the residual phase is mainly iron-containing phase when the solid solution temperature is 525 ℃.The slight overheating structure appears in the bar when the solid solution temperature is 550 ℃, and the serious overheating structure appears in the bar when the solid solution temperature reaches 570 ℃. Local recrystallization occurs when the bar is heated to 500 ℃, and complete recrystallization occurs when the solid solution temperature reaches 570 ℃. When the 2050 Al-Li alloy extruded bars are solution treated at different temperature (450-550 ℃) and aged at 170 ℃ for 40 h, the number of θ′ and T1 phases increases with the increase of solid solution temperature, and the strength increases rapidly and then slowly,when the solution treatment temperature is 550 °C, the yield strength and tensile strength of extruded rods are the highest, which are 505 MPa and 567 MPa, respectively; the elongation decreases rapidly at first and then remains stable with the increase of solid solution temperature, decreasing from 13.4% at 450 ℃ to 10.7%-10.4% at 500-550 ℃.
Qingfeng ZHU , Hao WANG , Yang GAO , Yifei LIN , Yubo ZUO . Effect of solid solution temperature on microstructure and properties of 2050 Al-Li alloy extruded bars[J]. Journal of Materials Engineering, 2023 , 51(11) : 71 -78 . DOI: 10.11868/j.issn.1001-4381.2022.000803
图3 不同固溶温度下2050合金挤压棒材偏光下的微观组织(a)挤压态;(b)450 ℃;(c)475 ℃;(d)500 ℃;(e)525 ℃;(f)550 ℃;(g)560 ℃;(h)570 ℃ Fig.3 Microstructures of 2050 alloy extruded bars with different solid solution temperatures under polarized light (a)as-extruded;(b)450 ℃;(c)475 ℃;(d)500 ℃;(e)525 ℃;(f)550 ℃;(g)560 ℃;(h)570 ℃ |
图5 525 ℃固溶淬火后2050合金挤压棒材SEM图Fig.5 SEM image of 2050 alloy extruded bars after solid solution treatment at 525 ℃ |
表2 图5中残余相的能谱分析结果Table 2 EDS analysis results of residual phases in fig.5 |
Element | Position A | Position B | ||
---|---|---|---|---|
Mass fraction/% | Atom fraction/% | Mass fraction/% | Atom fraction/% | |
Al | 70.03 | 83.30 | 58.67 | 76.49 |
Cu | 8.18 | 4.44 | 33.22 | 18.39 |
Fe | 12.99 | 7.47 | 8.11 | 5.12 |
Mn | 8.80 | 4.79 | 0.00 | 0.00 |
图6 不同固溶温度下2050合金挤压棒材沿不同晶带轴的TEM暗场像(a)500 ℃/〈001〉Al;(b)500 ℃/〈112〉Al;(c)550 ℃/〈001〉Al;(d)550 ℃/〈112〉Al (a)500 ℃/〈001〉Al;(b)500 ℃/〈112〉Al;(c)550 ℃/〈001〉Al;(d)550 ℃/〈112〉Al Fig.6 TEM dark field images of 2050 alloy extruded bars along different zone axis with different solid solution temperatures |
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