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Effect of trace titanium on the crack control of cast-rolling plate of 7050 aluminum alloy
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1.School of Material and Metallurgy,University of Science and Technology Liaoning;2.China

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Natural Science Foundation of China (No.51874172)

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    Abstract:

    The influence and mechanism of Ti addition on the crack formation of twin-roll casting plates of 7050 aluminum alloys (TRC-7050) plates were studied with field-emission scanning electron microscopy (FESEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD). The results showed that Ti addition significantly refine the grain sizes of the twin-roll casting plate, change the grain growth modes, improve the fluidity of the alloy, make the cast-rolled structure more dense, eliminate the local stress concentration in the alloy, and inhibit the occurrence of casting cracks. Appropriate amount of Ti addition can reduce the solid-liquid phase interval of the TRC-7050, reduce the temperature gradient of the nucleation solidification front and effectively inhibit the segregation of components, thereby reducing the number of low-melting compounds at the grain boundary and reducing the generation of coarse second phases, and then enhancing the resistance to the thermal cracking of the TRC-7050. 0.2 wt% Ti has the best inhibitory effect on the formation of TRC-7050 cracks. However, excess account of Ti addition will aggregate and form a sheet-like Ti-containing brittle phase, which subsequently will destroy the compactness of the structure and promote the initiation of cracks.

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[Hongbin Wang, Anni Gao, Hua Song, Zhen Xu, Shengli Li. Effect of trace titanium on the crack control of cast-rolling plate of 7050 aluminum alloy[J]. Rare Metal Materials and Engineering,2020,49(12):4055~4063.]
DOI:10.12442/j. issn.1002-185X.20190970

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History
  • Received:November 18,2019
  • Revised:December 08,2020
  • Adopted:February 20,2020
  • Online: January 13,2021
  • Published: