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《Acta Metallrugica Sinica》 1983-04
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STAGES ON STRAIN HARDENING CURVE AND ULTIMATE UNIFORM STRAIN

by HUANG Mingzhi; LUO Yingxi; HE Baoping (Xi'an 1Jiaotong University) (Manuscript received 2 June, 1982; revised manuscript 22 December, 1982)  
The true stress-strain curves of certain typical metals have been measured precisely with a diametrical extensometer improved by authors. According to the theoretical relationship which the ultimate uniform strain ε_B corresponds to the intersection of the flow stress curve and the rate of strain hardening curve, the effect of matrix and second phase on these two curves, i. e., on the ε_B has been investigated. Preliminary results have demonstrated that the dσ/dε νs e curve mainly depends on the matrix while the σ νs e curve is sensitive to the second phase. The strain hardening curve of a material obeying power hardening relation can be divided into three stages in a lg-lg plot except yielding stage. Thus, there are 3 strain hardening exponents n_1, n_2, n_3 and two knee strains ε_1, ε_2. It shows that n_1 is sensitive to the matrix state while n_2 is sensitive to the second phase. The existance of n_3 is a problem to be worth notice. Since there are several stages on the strain hardening curve the relation n=ε_B can not be established. It has shown that only those metals with high stacking fault energy can nearly suit with the relation n_2=ε_B under the condition ε_1ε_B.
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