摘要
利用 CW CO_2激光器对 Cu—27.3%Mn进行了系列表面熔凝实验,对该合金的组织形态和胞晶间距选择规律进行了研 究结果表明:随着生长速度的提高,组织形态由低速平界面向细胞晶和高速绝对稳定平界面转变在快速凝固条件下.Cu—Mn合& 的胞晶间距存在一个较大的选择范围,最大、最小和平均胞晶间距与生长速度的关系分别为 λmax=4.88vs~0.26, λmin=2.35vs~0.22和 λ= 3.66vs~0.25实验结果与
Laser rapid solidification experiments have been performed on Cu- 27.3%Mn alloy to investigate the response of microstructure pattern and cellular spacing selection to the variation of growth rate. As growth rate increases, microstructure goes from light band to fine cell and absolute stability planar. Experimental results show that there exists a wide distribution range in cellular spacing under laser rapid solidification condition, the distribution range and the average spacing decrease w ith increase of the growth rate. The maximum, λ=Max, minimum, λ=min, and average primary spacing, λ, as functions of growth rate vs, can be given by λmax= 4.88vs^0.26, λmin = 2.35vs0.22 and λ= 3.66vs0.25, respectively. The experimental results are compared with the current KGT model for rapid cellular/dendritic growth, and a reasonable agreement is found.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第1期13-16,共4页
Acta Metallurgica Sinica
基金
国家自然科学基金!59771054
关键词
激光快速凝固
平界面生长
胞晶间距
铜合金
laser rapid solidification, planar front growth, cellular spacing, absolute stability