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reinforced Ni-based alloy composite coatings were prepared on 7005 aluminum alloy by plasma spray. The effects of load, speed and temperature on the tribological behavior and mechanisms of the composite... that the composite coatings exhibit smaller friction coefficients and wear losses than the Ni-based alloy coatings under different friction conditions. The predicting time of the LS-SVM model is only 12.93......
构,再结晶退火后复合基带表面形成锐利的立方织构,其立方织构含量达到99.1%(≤10°),与商业用Ni5W合金基带水平相当. 关键词:镍基复合基带;热等静压;铜型织构;立方织构 中图分类号:TM 26 文献标志码:A Fabrication of Ni-based alloy composite substrate with high...: Ni-based composite substrate; hot isostatic press; copper-type texture; cube texture 1996年,美国橡树岭国家实验室(ORNL)的NORTON[1]等发现,金属纯镍(Ni)通过压延辅助双轴织构技术(RABiTSTM)能够形成锐利的立方织构.但是,由于其具有铁磁性(273 K时饱和磁化强度为0.575......
含共格畸变的立方合金粗化机制的原子层面计算机模拟研究 李永胜1,王永欣1,卢艳丽1,陈铮1 (1.西北工业大学,凝固技术国家重点实验室,陕西,西安,710072) 摘要:基于微观相场动力学模型,编制了包含共格畸变能的二元立方合金沉淀过程微观组织演化的计算机模拟程序,开展了不同共格畸变能作用下,溶质浓度为20at%的二元镍基合金的粗化机制的计算机模拟.研究发现:共格畸变能为零时,粗化遵循LSW机制,仅仅由颗粒的尺寸大小决定;随着共格畸变能的增大,粗化过程遵循混合机制,由沉淀颗粒的大小和位向(颗粒间的相对位置)共同决定;当共格畸变增大到一定程度时,粗化过程纯粹由颗粒间的位向决定,处于弹性"软"方向上的颗粒优先长大,而处于弹性"软"方向外的颗粒将消失掉. 关键词:镍基合金; 粗化机制; 共格畸变能; 计算机模拟; Ni-based alloy; coarsening mechanism......
Experimental 2.1 Materials A powder metallurgy (P/M) processed Ni-based superalloy, designated as CSU-A1, was used in this work. Table 1 lists its nominal composition. The master alloy was melted by vacuum...Trans. Nonferrous Met. Soc. China 28(2018) 451-460 Effect of cooling rate on microstructure and tensile properties of powder metallurgy Ni-based superalloy Han-hui DING1,2, Guo-ai HE1,2, Xin WANG1,2......
in the interface of γ/γ' phase, until fracture, which is thought to be the damage and fracture mechanism of alloy during creep at high temperature. Key words: Ni-based single crystal supperalloy containing Mo... and high stress[J]. The Chinese Journal of Nonferrous Metals, 2012, 22(7): 1921-1928. [9] YEH A C, SATO A, KOBAYASHI T, HARADA H. On the creep and phase stability of advanced Ni-based single crystal......
for the hydrogen absorption and desorption of the Mg-based alloy. Hence, Mg in the LaMg12 alloy was partially substituted by Ni in the present work. The nanocrystalline and amorphous LaMg11Ni+xNi (x=100...J. Cent. South Univ. (2017) 24: 773-781 DOI: 10.1007/s11771-017-3479-8 Gaseous hydrogen storage thermodynamics and kinetics of RE–Mg–Ni-based alloys prepared by mechanical milling ZHANG Yang-huan(张羊......
定向凝固DZ125合金的溶质分配系数及偏析行为的研究闵志先1,沈军1,冯周荣1,王灵水1,刘林1,傅恒志1(1.陕西省西安市西北工业大学凝固技术国家重点实验室)摘 要:采用定向凝固技术结合液淬法对DZ125合金平界面和枝晶生长条件下溶质的偏析行为进行了研究,通过EPMA定量测定γ基体中各元素的溶质含量和淬火平界面两侧固相和液相中的溶质含量,分别获得了溶质再分配后固相中的溶质分布状态及溶质分配系数.结果表明,平界面生长条件下,液相中的熔体流动使溶质再分布始终处于非稳态.Al,Ti,Ta,Mo和Ni元素的溶质分配系数小于1;而W,Cr和Co元素的溶质分配系数大于1,溶质分布状态满足Scheil模型.枝晶与平界面生长的溶质偏析行为基本一致,然而,固相反扩散显著降低了枝晶生长过程中的溶质偏析.关键词......
: cast Ni-based alloy; superalloy; grain boundary microstructure; mechanical property; lattice misfit; rafting 通常,普通铸造高温合金中通过加入元素C,B和Hf来强化晶界[1-3].这些元素也可以形成强化相,并且影响到凝固过程中的元素偏析,从而对合金性能造成影响.以往的工作大多数研究这些元素在多晶...力条件下的蠕变强度作用明显. 关键词:铸造镍基合金;高温合金;晶界组织;力学性能;错配度;筏形化 中图分类号:TG132.3 文献标志码:A Effect of Hf on microstructure and mechanical behavior of hot corrosion resistant Ni-based......
, China) Abstract: To repair a directionally solidified aero blade, laser cladding on DZ22 substrate using Ni-based alloy powder by Nd:YAG laser was carried out. The crystal orientation and performance... cut ditches on the surface of the cladding layer. Key words: Ni-based alloy; laser cladding; directional solidification; preferred orientation; boundary strengthen; friction; wear 现代高性能航空发动机对热端部件涡轮叶片的......
1073K时效时γ′相的形貌演化 Fig. 1 Morphologies evolution of γ′ phase of Ni-Al alloy aging at 1073K 根据文献[11]的取值,选择D=6.51×10-15cm2/s.设置512×512矩阵表示γ′相的形貌演化的区域,相邻两矩阵单元之间所代表的实际空间尺寸为l=19.系统的初始状态为Al成分cAl=0.18的均匀过... at growth stage of Ni-Al alloy evolution 表1对拟合参数值进行了整理.从表1中可看到,随着Al成分增加,m值总体上减小,说明γ′相的长大速度总体较快.但也发现,当cAl>0.19时,该规律失效.由此可知,随Al成分增加,形核长大阶段γ′相的生长速度并不呈线性关系.究其原因在于:当Al成分较低时,随Al成分增加,基体的过饱和度越大,促使γ′相的长大速度也越快,而当cAl......