定向凝固NiAl合金的拉伸行为研究

材料科学与工程学报, 2005, 23(3): 444-447. doi: 10.3969/j.issn.1673-2812.2005.03.033

定向凝固NiAl合金的拉伸行为研究

姜肃猛 ^1, , 齐义辉 ^2, , 孙广天 ^3, , 郭建亭 ^4,

1.辽宁工学院材料与化学工程学院,辽宁,锦州,121001

2.辽宁工学院材料与化学工程学院,辽宁,锦州,121001

3.辽宁工学院材料与化学工程学院,辽宁,锦州,121001

4.中国科学院金属研究所,辽宁,沈阳,110016

基金项目: 国家军工预研基金辽宁省博士科研项目(20021071) 辽宁工业大学校科研和教改项目

关键词：定向凝固 , NiAl , 反常屈服 , 中温脆性 , 超塑性

Investigation on the Tensile Behavior of Directionally Solidified NiAl Alloys

研究了定向凝固NiAl-Mo(Hf)和NiAl-Fe(Nb)合金的拉伸行为和显微组织变化.结果表明,两种合金在一定的拉伸条件下均具有反常的屈服行为和中温脆性.反常屈服和中温脆性行为与合金中含有的Ni3Al相有关.两种合金在高温时还表现出高应变速率的超塑性变形行为.超塑性变形的主要机理是位错滑移和攀移产生的应变硬化与动态回复和动态再结晶的应变软化作用相平衡.超塑性变形试样的断口呈韧性特征,在断裂区有孔洞产生.

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材料期刊网

定向凝固NiAl合金的拉伸行为研究

Investigation on the Tensile Behavior of Directionally Solidified NiAl Alloys

参考文献