【摘要】 通过对200-400℃范围内时效试样进行相变点测量和OM,SEM,XRD分析,对亚共析成分的CuAlBe形状记忆合金的热稳定性进行了系统研究。结果表明:在200-300℃温度范围短时间时效,合金的相变温度由于有序化过程的进一步进行而上升;在200-300℃温度范围长时间时效或300％以上温度时效,合金的相变温度明显下降,其原因是平衡相α和非平衡相α在合金中析出。更多还原

【Abstract】 The thermal stability of a hypoeutectoid CuAlBe SMA was studied in this paper. The aged specimens were performed by measuring phase transformation temperature, and observed by OM, SEM and XRD. Firstly, the phase transformation temperature of the alloy shortly aged at 200℃ up to 300℃ ascended with the evolving of the disorder to order transformation. Subsequently, the phase transformation temperature of the alloy sharply dropped with the equilibrium phase a or the nonequilibrium phase α precipitating on condition that the specimens were aged at 200℃ up to 300℃ for a long time or aged over 300℃ .更多还原