Angel iron, as you suggested, since rough is not an issue. Any finished lumber has sharp corners, if it does not need to be a sharp bend, 2x4 works. Use a rubbber or plastic hammer to help urge it into shape. Those tools are less likely to stretch the metal.
Press brake basics: 10 tips for bottom bending aluminum Bottom bending isn’t as common as it once was, but a knowledgeable operator should still be able to perform it efficiently and safely
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Does anyone have any tips on bending 1/8" x 1" flat 6061 Aluminum? This is flat stock from Home Depot if it matters. I am trying to make a shape like an EMT conduit clamp. Roughly "_/\_" only the raised section is rounded. The inside diameter is 1" and there is a small radius on the die to soften the bend where it goes flat.