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Increasing the annealing time decreases the recrystallization temperature for the start of recrystallization.During recrystallization stage, there is a significant drop in tensile strength, hardness and a large increase in the ductility of the material (See Figure 1).

Figure 1. Effect of annealing on tensile strength, hardness, ductility and grain size.

Reference£ºBy: Serdar Z. Elgun£¬September 17, 1999
http://info.lu.farmingdale.edu/d ... nnealingstages.html
3Â¥2011-08-08 01:09:41
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Microtensile stress-strain curves for submicrometer nanocrystalline aluminum thin films showing two distinct behaviors.7 The curve with the highest strength, gradual deviation from plasticity, and limited ductility is representative of a specimen that maintains its nanocrystalline grain size. By contrast, specimens observed to undergo stress-assisted room-temperature grain growth exhibit lower yield strengths and regions of extended plasticity.

Reference£ºThe Micro- and Nanoscale Tensile Testing of Materials
D.S. Gianola and C. Eberl
JOM£¬Vol. 61, No.3 pp. 24-35
http://www.tms.org/pubs/journals/jom/0903/gianola-0903.html
2Â¥2011-08-08 00:43:07
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СÀ¼»¨(½ð±Ò+7): °æÖ÷µÄÖªÊ¶ÃæÕæ¿í£¡Ð»Ð»£¡ 2011-08-08 23:19:44
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Figure 2: The stress-strain diagram clearly shows the differing characters of TRIP and TWIP steel. TRIP steel can resist high stresses without deforming. TWIP steel deforms with low stresses, but does not break until strain reaches around 90 percent.

refrence£º
Multi Phase Twinning-Induced Plasticity (TWIP) Steel
http://www.keytometals.com/page. ... site=kts&NM=207
4Â¥2011-08-08 01:14:33
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4Â¥: Originally posted by imrsfb at 2011-08-08 01:14:33:
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Figure 2: The stress-strain diagram clearly shows the differing characters of TRIP and TWIP steel.  ...

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