کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1578307 | 1001203 | 2011 | 4 صفحه PDF | دانلود رایگان |

The acoustic emission (AE) technique has been applied to in situ investigations of deformation processes of polycrystalline magnesium with various grain sizes in tension and compression from 20 to 300 °C. The AE signal of twin nucleation exhibited an asymmetry corresponding to the tension–compression flow stress asymmetry due to easier {1 0 1¯ 2} twinning in compression. A maximum in the AE signal is observed at 200 °C and is interpreted as a consequence of the synergetic effect of twinning and greater slip activity at higher temperatures. A larger grain size (600 μm) facilitated twinning.
► Significant tension–compression asymmetry remarkable also on acoustic emission response.
► Maximum of twinning activity at 200 °C.
► At 300 °C strong decrease of intensity of AE signal due to non-basal slip activity.
Journal: Materials Science and Engineering: A - Volume 528, Issue 18, 15 July 2011, Pages 5904–5907