由上图可知,Ni3Al体系的λ值最低,并满足了PPV标准。说明Ni3Al由较强的形成KW锁的倾向。多主元金属间化合物均位于PPV标准之上。对于位于C区域的合金,交滑移的驱动力为弹性各向异性,而位于C 区域的合金,{111}面上层错滑移至{001}面的...
图2 不同合金元素含量时Ni3Al1-xCx的弹性常数 3.2.2 层错能 作者采用 MedeA Deformation 计算\small Ni_3Al_{1-x}C_x 结构的层错能。图 3 为不同合金元素及浓度时 \small Ni_3Al_{1-x}C_x 的层错能。在纯 \small Ni_3Al 中, \small \gamma_c>\gamma_{a1}>\gamma_{a0}>\gamma_s,与实验...
Ni3AlReternary interdiffusionTernary interdiffusion in L12-Ni3Al with ternary alloying addition of Re was investigated at 1473K using solid-to-solid diffusion couples. Interdiffusion flux of Ni, Al, and Re were directly calculated from experimental concentration profiles and integrated for the ...
doi:10.1007/s12540-015-2127-9HanChang SukMetals and Materials InternationalHan C S.Microstructure of Carbide Precipitates in L12-Ni3Al and L10-TiAl. Metals and Materials International . 2008
本案例中作者计算分析了不同合金元素及含量的Ni3Al1-xCx结构,计算其弹性常数与层错能数据,分析了合金元素对合金交滑移的影响与屈服强度异常的现象,同时从层错能与各向异性参数的角度提出了合金设计的依据。快速计算出合金的层错能可以加速合金设计,如高通量方法或AIM模型。本研究为新型合金设计与材料计算指明方向,具有...
Wang, Phase-field study for the pre-precipitation process of L12-Ni3Al phase in Ni-Al-V alloy, Intermetallics. 38(2013) 144-149.Phase-field study for the pre-precipitation process of L1 2 -Ni 3 Al phase in Ni–Al–V alloy[J] . Yanli Lu,Liuchao Zhang,Yinping Chen,Zheng Chen,...
The site substitution behavior of Cr and Ta in the Ni3Al (L12)-type γ′-precipitates of a Ni–Al–Cr–Ta alloy is investigated by atom-probe tomography (APT) and first-principles calculations. Measurements of the γ′-phase composition by APT suggest that Al, Cr, and Ta share the Al ...
Using atomistic simulations, the authors evaluate the activation barrier for a screw superdislocation to form the Paidar–Pope–Vitek (PPV) locked configuration when intersecting a forest dislocation in L12 Ni3Al, as a function of the superpartial core width. It is shown that the PPV lock is ...
合金中DO22(Ni3V)到L12(Ni3Al)相变过程.结合微观组织原子图像演化和界面处原子占位几率演化,研究了异相间有序畴界的结构及其迁移特征,提出了DO22到L12相变过程的机制.研究表明,L12与DO22相间存在5种界面,DO22到L12相变过程中,除了界面(002)D//(00... 查看全部>>...