温升率对预载LY12试件热破坏影响的实验研究
Experimental study of effect of heating speed on mechanical properties of LY12 aluminum alloys
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摘要: 使用Gleeble 1500热力模拟实验系统研究了不同预载水平下的LY12铝合金试件在以不同温升率快速加热过程中的响应与破坏，实验结果不仅表明高温可使处于低应力水平下的试件发生破坏，而且表明在相同预载水平下，温升率越高则试件发生屈服和断裂时的温度就越高。对试件断口附近的金相组织的分析表明:高温升率下材料微观组织结构的热失配造成的材料微观组织的缺陷对试件的破坏过程具有控制作用。Abstract: A systematic in vestigation to the responses of specimens made of LY12 aluminum alloy subjected to different levels of pre-load and heated with different heating-rate is performed using a Glee ble-1500 thermal-mechanical material testing system. The near-tip metallurgra phics is also observed and analyzed. The investigation results show that both temperature and heating-rate play significant roles in the mechanical behavior o f LY12. For the same level of pre-load, an increase in heating-rate will increase both the yield and fracture temperature, and the high heating-rate induced inconsistence of local temperature accounts for the severe defect in the material and the failure of the meterial.
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Key words:
- strength /
- heating speed /
- elevated temperature /
- aluminum alloy /
- pre-load structure
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