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| AN INVESTIGATION OF THE PLASTIC ZONE IN THE VICINITY OF THE CRACK-TIP BY POSITRON ANNIHILATION TECHNIQUE |
| Ji Guokun; Liu Nianqing and Wang Shuying (Institute of High Energy Physics; Academia Sinica) and Jiang Jian; Xiong Liangyue and Long Qiwei (Institute of Solid State Physics; Academia Sinica; are now in the Institute of Metal Research; Academia Sinica) |
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Cite this article:
Ji Guokun; Liu Nianqing and Wang Shuying (Institute of High Energy Physics; Academia Sinica) and Jiang Jian; Xiong Liangyue and Long Qiwei (Institute of Solid State Physics; Academia Sinica; are now in the Institute of Metal Research; Academia Sinica). AN INVESTIGATION OF THE PLASTIC ZONE IN THE VICINITY OF THE CRACK-TIP BY POSITRON ANNIHILATION TECHNIQUE. Acta Metall Sin, 1981, 17(6): 677-681.
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Abstract Central cracked and single edge cracked α-Ti specimens were loaded up to different stress levels and cut into four test pieces after unloading. Both parameters, positron lifetime and Doppler broadening lineshape S parameters were measured in the plastic zone at the crack tip. The Doppler broadening lineshape S parameters were measured as a function of distance from the crack tip along the crack direction, It was found that the S parameters decrease monotonically along the crack direction until the boundary of the plastic zone is reached. The size of plastic zone estimated by the positron annihilation method seems to agree roughly with that obtained from that calculated by fracture mechanics.
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Received: 18 June 1981
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