CAJ | 학술논문

利用透射电子显微镜原位加热技术研究了快速凝固Al70 Cu10 Cr20合金中富Cr二十面体准晶的相变过程。结果表明，当加热温度达到700℃时，亚稳Al?Cu?Cr二十面体准晶相转变为具有体心立方结构的γ1相，其晶格常数为a＝0?91 nm。二十面体准晶相到γ1相的转变为扩散型相变、伴随着长程准周期序的破坏和原子团的瓦解。γ1相的形成经历了形核与晶粒长大阶段，其生长主要受Al原子和Cu原子的扩散控制。
이용투사전자현미경원위가열기술연구료쾌속응고Al70 Cu10 Cr20합금중부Cr이십면체준정적상변과정。결과표명，당가열온도체도700℃시，아은Al?Cu?Cr이십면체준정상전변위구유체심립방결구적γ1상，기정격상수위a＝0?91 nm。이십면체준정상도γ1상적전변위확산형상변、반수착장정준주기서적파배화원자단적와해。γ1상적형성경력료형핵여정립장대계단，기생장주요수Al원자화Cu원자적확산공제。
The phase transformation process of the Cr?rich metastable icosahedral quasicrystal phase ( I?phase ) during heating the rapidly?solidified Al70 Cu10 Cr20 alloy were investigated by means of in?situ TEM technique. It was observed that, when the heating temperature reached 700 ℃, the Cr?rich metastable I?phase transformed into the crystalline γ1?phase with a bcc structure and lattice constant of 0?91 nm. The I?to?γ1 phase transformation is a diffusion?controlled process including nucleation and grain growth of theγ1?phase, along with degradation of long?range quasiperiodic order and disintegration of the atomic clusters in the I?phase. The growth of the γ1?phase is mainly dominated by the diffusion of Al and Cu atoms.