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| Effect of Predeformation on Damping Capacity of Fe-19Mn and Fe-19Mn-1.5Si Alloys |
| HUANG Shuke1,2,ZHOU Danchen1,LIU Jianhui1,LI Changan1,LI Ning2,WEN Yuhua2( |
| 1.Institute of Mechanical Manufacturing Technology, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China; 2.School of Manufacturing Science and Engineering, Sichuan University, Chengdu 610065, China) |
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Abstract The effect of predeformation on damping capacity of Fe19Mn and Fe19Mn1.5Si alloys was studied. The damping capacity was measured using reversal torsion pendulum with free decay method. The stacking fault probability was determined by means of XRD (Xray diffraction). The microstructure was observed using OM (optical microscope). The results indicate that with the tensile strain increasing (0%-10%), the stacking fault probability in γaustenite and εmartensite of Fe19Mn alloy increases continually. When the tensile strain is above 4%, however, Shockley partial dislocations are cut into several segments because of the reciprocal chiasm of stacking faults and perfect dislocations gliding, so the distance of two strong points decreases. The damping capacity of Fe19Mn alloy, therefore, is improved with the tensile strain increasing until it reaches maximum at 4%, and then decreases. But it is not the same regularity to Fe19Mn1.5Si alloy when tensile strain is above 4%. The εmartensite and stacking faults are small before deformation, so the predeformation can not change the microstructure of Fe19Mn1.5Si alloy and the damping capacity does not decrease when tensile strain is above 4%, but is still increasing stably.
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Received: 01 March 2009
Published: 31 May 2010
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