测定Ni-Al合金XRD相组成用纯NiAl_3的制备工艺  

Preparing Process of Pure NiAl_3 Samples Used for XRD Measurements of the Phase Composition in Ni-Al Alloy

作　　者：巴发海[1] 张瑞丰[2] 王东立[2] 沈宁福[2] 

机构地区：[1]北京科技大学材料学院,北京100083 [2]郑州工业大学材料研究中心,河南郑州450002

出　　处：《钢铁研究学报》2000年第5期66-69,共4页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目 !(5 97710 33)

摘　　要：:传统的萃取工艺难以制得高纯度的 Ni Al3相 ,将这种 Ni Al3相与等量 α- Al混合后测得的 K值有较大的误差 ,仅适用于测量精度要求不高的情况。为了用 XRD准确测定 Ni- Al合金的相组成 ,作者用萃取和平衡凝固两种方法对 Ni Al3相 K值测定时使用的纯相制备工艺进行了实验研究。研究证实 ,熔融合金以小于 2 K/h的冷却速度缓慢凝固至固相线以下 ,可得到 α- Al与 Ni Al3两相的质量比接近于 1的相组成 ,用此试样测得的 K值经修正后可用于未知试样中 NiThe preparing process of pure NiAl 3 samples was investigated by means of Solution Leaching (SL) and Equilibrium Solidification (ES) in order to measure the phase composition in Ni Al alloy by XRD. The experimental results showed that the phase mass ratio (NiAl 3: α Al) reaches nearly 1 when the alloy (Ni 11 Al 89 ) melt was cooled down to the solidus temperature at a speed of less than 2 K/h. Using the corrected K value as measured in obtained sample, the content of the NiAl 3 phase in unknown samples of Ni Al alloys can be calculated precisely. For the SL processing, it is very difficult to prepare the pure NiAl 3 phase, when mixed with equivalent α -Al, thus measured K value usually deviated from the real K value by a significant error. Therefore, SL processing can only be applied to the case of approximate measurements.

关 键 词：测定 XRD 相组成 制备工艺 NI-AL合金 NIAL3 萃取 平衡凝固 

分 类 号：TG115.2[金属学及工艺—物理冶金]