·1354. 工程科学学报，第40卷，第11期 20m 1m 4 原始材料 3 40 0.2 0.4 0.6 0.8 1.0 原始材料$500-2hT950-3hT950-3h-S500-2小h 晶粒尺寸m 热处理状态 图2原始材料(a)和T950-3h材料(b)的纵截面金相照片：原始材料截面品粒尺寸分布的统计结果（©）：各热处理状态合金横截面内平均 品粒尺寸统计结果(d) Fig.2 Representative OM images showing the longitudinal grains in the original Fe-Ni alloy wire (a)and T950-3h wire (b);the statistical results of the grain size distribution in the original Fe-Ni alloy wire (c);the average grain diameter of the four alloys (a) (200(220). (200). 51/mm id 图3原始材料纵截面透射电镜照片(a)及相应的衍射花样(b):500-2h材料中的低倍透射电镜照片（©）和纳米颗粒（白色方框）高分辨率 透射电镜照片(d) Fig.3 Representative longitudinal TEM image (a)and corresponding diffraction patter b)of the original Fe-Ni alloy wire;representative TEM image (c)of the 500-2h alloy and HRTEM image (d)showing nanosized precipitates that are marked by white squares工程科学学报,第 40 卷,第 11 期 图 2 原始材料(a)和 T950鄄鄄3h 材料(b)的纵截面金相照片;原始材料截面晶粒尺寸分布的统计结果(c);各热处理状态合金横截面内平均 晶粒尺寸统计结果(d) Fig. 2 Representative OM images showing the longitudinal grains in the original Fe鄄鄄Ni alloy wire (a) and T950鄄鄄3h wire (b); the statistical results of the grain size distribution in the original Fe鄄鄄Ni alloy wire (c); the average grain diameter of the four alloys 图 3 原始材料纵截面透射电镜照片(a)及相应的衍射花样(b);500鄄鄄2h 材料中的低倍透射电镜照片( c)和纳米颗粒(白色方框)高分辨率 透射电镜照片(d) Fig. 3 Representative longitudinal TEM image (a) and corresponding diffraction pattern ( b) of the original Fe鄄鄄Ni alloy wire; representative TEM image (c) of the 500鄄鄄2h alloy and HRTEM image (d) showing nanosized precipitates that are marked by white squares ·1354·