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Match the materials in Group 1 with the possible microstructure adjacent to the fusion line in the heat affected zone, in Group 2.
Match the materials in Group 1 with the possible microstructure adjacent to the fusion line in the heat affected zone, in Group 2.
| Group 1 | Group 2 |
| P. Pure aluminium | 1. Martensite |
| Q. 0.6 mass% carbon steel | 2. Grain boundary precipitation |
| R. Aged AI 4.5 mass% Cu alloy | 3. Coarse precipitates |
| S. 18/8 stainless steel | 4. Bainite |
| 5. Coherent precipitates | |
| 6. Twins | |
| 7. Grain growth |
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