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Abstract It has been observed that the Knoop microhardness value of single crystals of calcite can be reduced 2 to 8 percents and fine microerack or micro-region break would occur on the polished surfaces of samples after exposure to 0.1 to 0.4 MPa hydrogen gas for 2 hours. The dropping amplitude would increase and traces of microcracks expanding automatically and cleavage fractures occur on the polished surfaces due to extension of exposure time and growth of hydrogen pressure,and crystal parameters, a and c, would decrease slightly at the same time. Similar phenomena were observer for dolomite ,antigorite, LiF and SlO_2 single crystals. Reduction in strength and stress cracking, caused by hydrogen diffusion,imply that hydrogen embrittlement exists in nonmetals as in metals. The changing of crystal structure may provide a clue to the understanding of hydrogen embrittlement in nonmetals,but more detailed study about its causes and mechanism are needed.
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Received: 25 February 1992
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Cite this article:
Su Qichu (Zhengzhoum University) E. E. Angino and E. J. ZeUer (The University of Kansas). THE INFLUENCE OF HYDROGEN GAS ENVIRONMENT ON CRYSTAL PARAMETER AND MICROHARDNESS OF SINGLE CRYSTAL OF CALCITE. J Chin Soc Corr Pro, 1992, 12(1): 34-40.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1992/V12/I1/34
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