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jic8417(½ð±Ò+1):лл²ÎÓë 2010-11-26 00:40:10
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yangbin-1987(½ð±Ò+2): 2010-11-27 02:46:23
|
I guess there are two possibilities: (i) silicon mark and (ii) black line. The first one is due to heterogeneous spatial distribution of Si and/or Mg containing particles, i.e., the dark band contains much more Si, Mg particles than elsewhere. This is a defect of casting and homogenization. You really cannot do anything, but you can complain your supplier. The second one is due to local high pressure and/or high temperature during extrusion. Again, you cannot do anything, but you can modify your extrusion condition to avoid the same problem next time. |
11Â¥2010-11-26 07:33:52
12Â¥2010-11-26 15:52:32
13Â¥2010-11-29 20:42:19
14Â¥2015-04-03 14:13:41













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