材料科学
铝热剂
金属间化合物
焊接
压痕硬度
合金
冶金
维氏硬度试验
扫描电子显微镜
放热反应
抗剪强度(土壤)
复合材料
铝
微观结构
土壤水分
土壤科学
有机化学
化学
环境科学
作者
Ehsan Bahrami Motlagh,Jalil Vahdati Khaki,Mohsen Haddad Sabzevar
标识
DOI:10.1016/j.matchemphys.2012.01.086
摘要
In this work, first, a metastable composite powder of “14Al–3CuO–Ni” with a decreased ignition temperature was obtained via Arrested Reactive Milling (ARM), then this exothermic blend was used for welding of 1100 Aluminum alloy. The reactive media and the weld zones were investigated using scanning electron microscope. X-ray diffraction experiment and morphological investigations accompanied with the EDS analyses were carried out in order to evaluate the reactions’ products. Vickers microhardness profile across the joint and the shear strength of the joints were determined. The weld zone thickness in each of the parent alloys was measured to be 750 μm, approximately. Results showed that different reactions occurring during the process lead to the in situ formation of different intermetallic compounds such as Al3Ni2 and Al7Cu4Ni as well as Al2O3 nanoparticles at the interface. Thus, this area has the maximum hardness (80–90 VHN) and the minimum hardness of 35 VHN belongs to the parent alloys. The mean shear strength of the obtained joints was 27 MPa.
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