用高温金相显微镜、扫描电镜和正电子湮没技术研究了空位型晶体缺陷对Cu-Al-Zn-Mn-Ni合金马氏体逆转变和形状记忆效应的影响。正电子湮没Doppler增宽线形参数和寿命谱测量以及金相组织观察和晶体结构分析结果表明,马氏体逆转变起始温度、逆转变温度区间宽度以及形状记忆最大恢复率随淬火冷却介质温度的显著变化可以用空位型晶体缺陷浓度的变化给予较好的解释.
High temperature microscope, scanning electron microscope and positron annihilation techniques have been used to study the influence of vacancy type crystalline defects on reverse martensite transformation and shape memory effect in a Cu-Al-Zn-Mn-Ni alloy. Experimental results indicate that by decreasing cooling medium temperature, the reverse transformation is shifted to higher temperatures and completed in a wider temperature range, and the maximum shape recovery ratio is correspondingly decreased. But decreasing cooling medium temperature further to below a certain point will then result in a lower reverse transformation temperature and a narrower temperature range of completion, and a higher maximum shape recovery ratio. Some anomaly is observed when the specimen is quenched into A_f-M_f range. The experimental results are well explained according to the average life time τ and Doppler broadening line-shape parameter S of positron annihilation as well as the analysis of microstructure.
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