王洪斌,高安妮,宋华,徐振,李胜利.钛对7050铸轧板材裂纹调控的影响[J].稀有金属材料与工程,2020,49(12):4055~4063.[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.]
钛对7050铸轧板材裂纹调控的影响
投稿时间:2019-11-18  修订日期:2020-12-08
中文关键词:  铝合金  铸轧  微合金化  裂纹
基金项目:国家自然科学基金No.51874172
中文摘要:
      本文采用场发射高分辨扫描电子显微镜,差示扫描量热仪,X射线衍射仪等先进设备研究了微量Ti元素对7050铝合金铸轧薄板裂纹形成的影响规律和调控机理,结果表明:微量的Ti可以显著细化铸轧板的晶粒组织,改变晶粒生长方式,改善合金的流动性,使铸轧组织更加致密,消除合金内局部应力集中,抑制铸轧裂纹出现。而且,适量Ti元素还可以缩短铸轧7050铝合金的固液相线区间,减小晶核凝固前沿温度梯度,有效抑制成分偏析,从而降低晶界低熔点化合物数量,减少粗大第二相的产生,从而大幅增强铸轧铝合金的抗热裂能力。当7050铸轧板中Ti含量达到0.2%时,Ti对铸轧板裂纹的抑制作用最佳,而过量的Ti元素会聚集形成大块的含Ti脆性相,反而破坏组织的致密性,促进裂纹的萌生。
Effect of trace titanium on the crack control of cast-rolling plate of 7050 aluminum alloy
英文关键词:Aluminum alloys  Twin-roll casting  Microalloying  Crack
英文摘要:
      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.
作者单位E-mail
王洪斌 辽宁科技大学 1763538898@qq.com 
高安妮 辽宁科技大学  
宋华 辽宁科技大学  
徐振 辽宁科技大学  
李胜利 辽宁科技大学  
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