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Microstructure and Mechanical Properties of 6061 Al/AZ31 Mg Joints Friction Stir Lap Welded by a Tool with Variable-Pitch Thread Pin
| Content Provider | MDPI |
|---|---|
| Author | He, Changshu Qiu, Chengpeng Zhang, Zhiqiang Wei, Jingxun Zhang, Hao Tian, Ni Qin, Gaowu |
| Copyright Year | 2020 |
| Description | Sheets of 6061-T6 aluminum alloy (thickness = 3 mm) and AZ31 magnesium alloy were friction stir lap welded by a tool with a variable-pitch thread pin (coarse-threaded in the upper part and fine-threaded in the lower part). For the same rotation speed and welding speed, the heat input was higher in joints with an upper Al alloy (Configuration Al-Mg) than in those with an upper Mg alloy (Configuration Mg-Al). In Configuration Al-Mg, these two dissimilar metals were poorly mixed and Al dominated the stirred zone (SZ). Many intermetallic compounds (IMCs) of Al3Mg2 formed inside the SZ. In Configuration Mg-Al, Mg alloy bands, flocculent Al12Mg17 bands, and minor Al alloy bands intersected in the SZ, forming a complex onion-ring structure. Moreover, a complex mechanical interlocking structure developed at the bottom interface of the SZ. The maximum tensile shear strengths of the Al-Mg and Mg-Al lap configurations were 160.3 and 217 N/mm, respectively, at 700 rpm. The higher tensile shear strength of the Mg-Al configuration primarily represented less IMCs and complex mechanical interlocking structures in the SZ. |
| Starting Page | 34 |
| e-ISSN | 20754701 |
| DOI | 10.3390/met11010034 |
| Journal | Metals |
| Issue Number | 1 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-12-26 |
| Access Restriction | Open |
| Subject Keyword | Metals Manufacturing Engineering Friction Stir Lap Welding Variable-pitch Thread Pin Dissimilar Metals Metal Flow Intermetallic Compounds |
| Content Type | Text |
| Resource Type | Article |
