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The microstructures and the mechanical properties of two Fe-26Mn-xAl-1C steels with 8 and 10 % Al have been investigated at different strain rates. The results show that Fe-26Mn-10Al-1C steel possesses higher strength and at the same time higher ductility than Fe-26Mn-8Al-1C steel at both low and high strain rates. The strengths of the steels increase and ductility declines slightly with increasing strain rate. These observations can be attributed to the different strain hardening mechanisms acting at different strain rates. Planar slip occurs and microbands form duringthe steady state stage, whereas deformation twinning occurs in the final stage ofdeformation. The higher strain hardening at high strain rates are due to the strong increase in the twinning propensity. The strain hardening at high strain rates also depends on the adiabatic heating, causing a competition between softening and strain hardening.

Effect of cigarette draw resistance between 860-1130Pa on deliveries of phenol in mainstream cigarette smoke(MCS)was investigated, and contribution degree of cigarette hazard index was proposed for the first time to study how the contribution degree could be affected by 7 harmful components. Effect of phenol with different draw resistance on contribution degree of cigarette hazard index was also studied. The results showed that contribution degree of phenol is uniform, which is different from variation of crotonaldehyde, HCN, CO and NNK, meanwhile, 1000Pa could be viewed as critical draw resistance, and there is an obvious mainstream cigarette smoke variation below and above 1000Pa. Analysis of contribution degree of cigarette hazard index separately is a feasible tool to study variation of smoke harmful components, which lays foundation for further changing trend and roles of different harmful components while the cigarette hazard index changes.