针对巴氏合金ZChSnSb11-6工作过程中的蠕变现象,对合金进行蠕变实验。基于蠕变实验所得蠕变曲线,证实ZChSnSb11-6在实际工作条件下会发生明显的蠕变现象,同时利用WDW-E100D试验机,获得ZChSnSb11-6蠕变前后的屈服强度等力学性能。通...针对巴氏合金ZChSnSb11-6工作过程中的蠕变现象,对合金进行蠕变实验。基于蠕变实验所得蠕变曲线,证实ZChSnSb11-6在实际工作条件下会发生明显的蠕变现象,同时利用WDW-E100D试验机,获得ZChSnSb11-6蠕变前后的屈服强度等力学性能。通过分析合金蠕变、力学性能和显微组织之间的关系,得知蠕变明显降低ZChSnSb11-6的强度、塑性及抗弹性变形能力,并得到合金蠕变机理,明确ZChSnSb11-6蠕变变形是应变硬化与再结晶回复长时间交替作用的结果。通过计算合金的应变硬化指数,证实蠕变使合金均匀变形的能力降低,增大合金发生断裂破坏的可能性。同时,基于硬度试验获得合金硬度随温度变化的计算公式,确定ZChSnSb11-6的蠕变临界温度范围为50~60℃。通过观察ZChSnSb11-6蠕变前后的显微组织,发现蠕变使合金组织中SnSb和Cu 6 Sn 5明显减少,导致合金力学性能降低。展开更多
Internal friction and micro-creep measurements were performed with high-purity aluminium bamboo-crystal specimens.The relaxation strength was found to decrease with the decrease of temperature and became zero at about...Internal friction and micro-creep measurements were performed with high-purity aluminium bamboo-crystal specimens.The relaxation strength was found to decrease with the decrease of temperature and became zero at about 0.4 T_m(T_m is the melting temperature).This re- flects the occurrence of local disordering in the bamboo boundary region at this temperature. This result conforms to the picture of grain-boundary disordering constructed by atomic simulation studies.展开更多
文摘针对巴氏合金ZChSnSb11-6工作过程中的蠕变现象,对合金进行蠕变实验。基于蠕变实验所得蠕变曲线,证实ZChSnSb11-6在实际工作条件下会发生明显的蠕变现象,同时利用WDW-E100D试验机,获得ZChSnSb11-6蠕变前后的屈服强度等力学性能。通过分析合金蠕变、力学性能和显微组织之间的关系,得知蠕变明显降低ZChSnSb11-6的强度、塑性及抗弹性变形能力,并得到合金蠕变机理,明确ZChSnSb11-6蠕变变形是应变硬化与再结晶回复长时间交替作用的结果。通过计算合金的应变硬化指数,证实蠕变使合金均匀变形的能力降低,增大合金发生断裂破坏的可能性。同时,基于硬度试验获得合金硬度随温度变化的计算公式,确定ZChSnSb11-6的蠕变临界温度范围为50~60℃。通过观察ZChSnSb11-6蠕变前后的显微组织,发现蠕变使合金组织中SnSb和Cu 6 Sn 5明显减少,导致合金力学性能降低。
文摘Internal friction and micro-creep measurements were performed with high-purity aluminium bamboo-crystal specimens.The relaxation strength was found to decrease with the decrease of temperature and became zero at about 0.4 T_m(T_m is the melting temperature).This re- flects the occurrence of local disordering in the bamboo boundary region at this temperature. This result conforms to the picture of grain-boundary disordering constructed by atomic simulation studies.