摘要
研究了不同含钛量(分别为0 07%Ti、0 13%Ti、0 19%Ti)的原位钛合金化A356合金的微观组织和力学性能,并与相应含钛量熔配加钛A356合金进行了对比,发现原位钛合金化A356合金的二次枝晶臂间距小于熔配加钛合金,随着钛含量增加二次枝晶臂减小且趋势相同。较低钛含量原位钛合金化合金综合力学性能优于熔配加钛合金,但钛含量较高时两种合金的性能差别变小,甚至低于熔配加钛合金,原因在于较高钛含量的原位钛合金化合金中较高的铁含量严重降低了合金的塑性。
The microstructure and mechanical properties of in-situ titanium alloying A356 alloys with different titanium contents (0.07%Ti,0.13%Ti,0.19%Ti respectively) were investigated and compared with that of A356 alloys alloyed by melting Al-Ti master alloys. It has been found that the secondary dendrite arm spacing of the former is smaller than that of the latter and the decrease trend with increasing titanium content is similar for both kinds of alloys. For the alloys with low titanium content,the overall mechanical properties of in-situ titanium A356 alloys are obviously superior to that of alloys alloyed by melting method. For the alloys with high titanium content,however,the superiority of the overall mechanical properties of the former decreases and even lowers than that of the latter. The reason is that the high content iron in in-situ titanium alloying high titanium A356 alloys has the dramatically destructive effect on the mechanical properties,especially on the plasticity.
出处
《铸造》
CAS
CSCD
北大核心
2004年第10期779-783,共5页
Foundry
基金
河南省重大科技攻关项目(0322020600)。
关键词
原位钛合金化
A356合金
二次枝晶臂间距
力学性能
in-situ titanium alloying
A356 alloy
secondary dendrite arm spacing
mechanical properties
