中文摘要：

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。

英文摘要：

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.