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| 1 | Mathematical analysis and its experimental comparisons for the accumulative roll bonding(ARB)process with different superimposed layers显示文摘Based on the traditional two-layer accumulative roll bonding(TARB),the geometrical variations and mathematical relationship during the four-layer accumulative roll bonding(FARB)were derived and summarized.Furthermore,the multi-layer accumulative roll bonding(MARB)technology was proposed and the geometrical variations and mathematical relationship of MARB were simultaneously derived and summarized.Experimentally,Mg-14Li-3Al-2Gd(LAGd1432)sheets were fabricated by TARB and FARB,respectively.Compared with the TARB,the FARB has a higher accumulative efficiency in terms of accumulative layers,total number of interfaces,interface spacing,total deformation and equivalent strain.Therefore,the FARB-processed sheets in lower cycles have the similar microstructure and mechanical properties of the TARB-processed sheets in higher cycles.In addition,FARB process can further break through the deformation limit of TARB process in a single cycle through adopting two-step rolling in one cycle with 50%deformation in one pass and 75%accumulative deformation in one cycle,which can effectively solve the problem of poor interface bonding of the latest interface brought by the last cycle,and thus significantly improve the phenomenon of unstable performance of the ARB-processed sheets. | Haipeng Zheng Ruizhi Wu Legan Hou Jinghuai Zhang Milin Zhang | 2021 | Journal of Magnesium and Alloys2021,9,5: | 4 |
| 2 | 衬板轧制铝/镁/铝复合板的波纹界面结构及形成机理显示文摘提出一种采用衬板轧制进行AA1060铝/AZ31B镁/AA1060铝复合板的制备方法。结果表明:传统轧制铝/镁/铝复合板截面轮廓较为平直,而衬板轧制由于衬板可将剪切力部分转化为压应力,从而改变复合板板受力状态,在铝/镁界面连接处形成差速流动,故而界面轮廓呈现波浪状特征,层间实现互锁连接。界面连接强度为64 MPa,是传统轧制复合板的4倍。力学性能测试表明:衬板轧制复合板的抗拉强度可达210 MPa,比传统轧制法提高12.3%。综上可知,衬板轧制法为高性能铝/镁/铝异质复合板成形制造提供一种新思路。 | 霍鹏达 李峰 王野 李超 | 2023 | Transactions of Nonferrous Metals Society of China2023,33,4: | 2 |
| 3 | 设计AZ91层合板以实现强韧性结合显示文摘通过交替堆叠不同状态下的AZ91挤压板设计三种类型的层合板,以改善其力学性能。拉伸试验表明,固溶处理后的板材与时效处理后的板材相结合,可获得较高的抗拉强度和塑性,即极限抗拉强度和伸长率分别约为386MPa和19.8%。电子背散射衍射(EBSD)和透射电镜(TEM)结果表明,时效处理层中析出的纳米颗粒较多,晶粒尺寸较小,具有较高的强度和合理的塑性,而固溶处理层中位错密度较低,有利于应变硬化。此外,连续层间的强界面结合对延展性的提高起着重要作用。 | 陈祥 王玮璋 张军磊 黄光胜 刘帅帅 汤爱涛 蒋斌 潘复生 | 2021 | Transactions of Nonferrous Metals Society of China2021,31,12: | 2 |
| 4 | 大厚比Al/Mg/Al层合板的热轧工艺与性能显示文摘通过热轧工艺制备初始厚度比(单层镁初始厚度与单层铝初始厚度的比值)为5~40的Al/Mg/Al层合板。采用模拟和实验相结合的方法研究初始厚度比对Al/Mg/Al层合板的应力场、应变场、组织演变和性能的影响。结果表明,随着初始厚度比的增加,层合板的极限抗拉强度和屈服强度增加,界面结合强度和伸长率先增加后降低。当初始厚度比为20时,大厚比Al/Mg/Al层合板具有最佳的综合力学性能,界面结合强度(剥离强度)和伸长率达到最大值,其值分别为12.3 N/mm和23.32%。同时,从模拟和EBSD结果可以看出,当初始厚度比为20时,层合板的变形协调能力最好,铝侧织构转变为剪切织构。当初始厚度比达到40后,层压板的结合性能降低,镁合金的性能占主导地位。 | 李婷 王涛 刘文文 黄志权 姜正义 黄庆学 | 2023 | Transactions of Nonferrous Metals Society of China2023,33,12: | 0 |
| 5 | Zn层添加AZ31/7075合金复合成形工艺及组织与性能研究显示文摘通过在异种材料界面添加厚度为100μm的Zn箔,采用预挤压与孔型轧制复合工艺成功制备出AZ31/7075复合材料,并利用光学显微镜(OM)、扫描电子显微镜(SEM)、能谱分析(EDS)对复合界面进行表征及显微硬度测试,探究Zn过渡层在挤压复合孔型轧制过程中对产品的影响。结果表明:7075硬质铝合金芯部可细化AZ31镁合金,引入Zn过渡层可减少或者避免镁铝系金属间化合物生成;挤压及变形温升使Mg-Zn互扩散形成的低熔点共晶相熔化,同时加速元素自固相向液相扩散;然而降温冷却使Mg-Zn扩散层易出现不连续裂缝,但后续孔型轧制可显著改善;Mg-Zn扩散层经变形生成的MgZn_(2)金属间化合物具备较高的显微硬度(161HV),但Mg-Zn扩散层变形后厚度则较薄,结合层整体硬度变化不明显。 | 余晖 任军超 杨鑫 郭舒龙 余炜 冯建航 殷福星 辛光善 | 2022 | 材料工程2022,50,3: | 0 |