(1. 中国科学院 金属研究所，沈阳 110016；
2. 上海大学 材料科学与工程学院，上海 200444)
摘 要: 用螺旋选晶器法制备DD483抗热腐蚀单晶高温合金，在偏离度小于10°时测试合金从室温到1 000 ℃的瞬时拉伸性能；研究0~30°范围内偏离度对合金室温和950 ℃拉伸性能的影响。结果表明：由于单相γ′的反常屈服行为，750 ℃时合金的抗拉强度达到峰值1 300 MPa，屈服强度达到1 105 MPa；偏离度在0~30°范围内，DD483合金室温及950℃时的屈服强度和抗拉强度均随偏离度增加而减小，塑性随偏离度的增加而增大；不同偏离度样品的室温拉伸的变形机制并没有明显差别，拉伸性能的差异主要在于Schmid因子和弹性模量的不同；950 ℃时由于开动滑移系数目的增加，偏离度对合金拉伸强度的影响相对室温的影响减小。
关键字: 镍基单晶高温合金；DD483合金；抗热腐蚀；拉伸性能；偏离度
hot corrosion resistant single crystal superalloy DD483
（1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China）
Abstract:A hot corrosion resistant single crystal superalloy DD483 made by helix selector method was tested in tension from room temperature (RT) to 1 000 ℃ with disorientation less than 10° and the effects of disorientation within 0−30° on tensile properties at RT and 950 ℃ were researched, respectively. The results show that for the reason of abnormal yield behavior of γ′ single phase, the yield strength and ultimate tensile strength reach the peak values at 750 ℃, after which the yield strength and ultimate tensile strength drop sharply with the increase of temperature; within the disorientation of 0−30°, the yield strength and ultimate tensile strength of DD483 alloy decrease and the plasticity increases at both RT and 950 ℃ with the increase of disorientation; the difference of tensile properties at RT is mainly caused by different Schmid factors in the corresponding direction; the effect of disorientation on tensile properties at 950 ℃ is not as obvious as that at RT for activation of additional slip systems.
Key words: Ni-based single crystal superalloy; DD483 alloy; hot corrosion resistance; tensile properties; disorientation
