アルミニウムおよびアルミニウム-マグネシウム合金の強度の温度およびひずみ速度依存性

概要

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The effects of temperature and strain-rate on the strength of polycrystalline pure aluminium and on that of aluminium-magnesium alloy have been investigated within the range of temperature from -195 to 450℃ and strain-rate from 10^<-4> to 3×l0^2/s. The test results have been studied from the standpoint of the thermally activated deformation theory. The parameter Z=ε^^・exp(H_t/R. T. ) (ε^^・ is the strain-rate, H_t the apparent activation energy, R gas constant and T the absolute temperature) is effective in prescribing the flow stress in two limited temperature ranges (The intermediate temperature range and the high temperature range) up to ε^^・=10〜50/s. In the case of pure aluminium, the value of the apparent activation energy H_t increases with the increase of strain (H_t=6 600〜19 000 cal/mol for ε=5〜20%) in the intermediate temperature range (-20〜80℃) and is nearly constant (H_t=34 000〜32 000 cal/mol) in the high temperature range (250〜450℃), while in the case of aluminium-magnesium alloy, H_t is nearly constant in the intermediate temperature range (-20〜80℃) and also in the high temperature range (350〜450℃) (H_t = 9 000〜12 000 cal/mol and 42 000〜39 000 cal/mol respectively).
社団法人日本材料学会の論文
1971-03-15