ORDER STATE AND STABILITY OF MARTENSITE IN AN AIR-QUENCHED Cu-Zn-Al ALLOY

来源期刊：中国有色金属学报(英文版)1996年第3期

论文作者：Wang Mingpu Jin Zhanpeng Yin Zhimin Xu Genyin

文章页码：113 - 118

Key words：shape memory alloy;　Cu-Zn-Al alloy;　martensite;　ordering;　stabilization

Abstract: The martensite structure and its order state of Cu-18Zn-14Al(atomic fraction) alloy were studied by X-ray diffraction experiment and its intensity analysis. It is convinced that the M18R martensite with fairly perfect long-range order can be obtained by air-quenching the alloy. The atomic ordering configurations are two kinds of nearest neighboring (nn) order (K=even,H+K/2)=odd), i. e, Al-Cu atoms ordering and Zn-Cu atoms ordering, and one kind of next nearest neighboring (nnn) order (K=odd), i. e AlZn atoms ordering. The atomic distribution on the basic plane of the martensite is as follows:Ⅰ—14/25Al+11/25Cu,Ⅱ—Cu,Ⅲ—18/25Zn+7/25Cu. The martensite stabilization occurs in the alloy even on perfect ordering condition.