【摘 要】
：
The effect of austenite aging at 823 K on the microstructures and martensitic transformation behavior of Co46Ni27Ga27 alloy has been investigated using optical
【机 构】
：
School of Materials Science and Engineering,Beijing Key Laboratory for Advanced Functional Materials
论文部分内容阅读
The effect of austenite aging at 823 K on the microstructures and martensitic transformation behavior of Co46Ni27Ga27 alloy has been investigated using optical microscopy (OM),transmission electron microscopy (TEM),X-ray diffraction analysis (XRD),and differential scanning calorimeter (DSC).The microstructure observation results show that the unaged Co46Ni27Ga27 alloy is composed of the tetragonal nonmodulated martensite phase and face-centered cubic γ phase.It is found that a new nanosized fcc phase precipitates in the process of austenite aging,leading to the formation of metastable age-affected martensite around the precipitates with composition inhomogeneity.Two-stage reverse martensitic transformation occurs in the samples aged for 2 and 24 h due to the composition difference between the age-affected martensite and the original martensite.For the Co46Ni27Ga27 alloy aged for 120 h,no reverse transformation can be detected due to the disappearance of the metastable age-affected martensite and the small latent heat of the original martensite.The martensitic transformation temperatures of the Co46Ni27Ga27 alloy decrease with an increase in aging time.
其他文献
从科学与经验中都可以获知,要想提高档案管理的水平就必须实行标准化、规范化的工作程序与方法,即要求档案管理的收集、整理、鉴定、著录、保管等各个环节都要按照统一的程序
A novel immune algorithm suitable for dynamic environments (AIDE) was proposed based on a biological immune response principle.The dynamic process of artificial
随着国家和地方的排放标准的提高，大多数污水处理厂由于以前设计上的局限，处理后的水质的一些指标达不到新的标准要求。该文主要介绍广州市猎德污水处理厂在采用化学除磷过程中
The microstructures and mechanical properties of Ni-(46 - x)Ti-4Al-xZr (x =0-8,at.％) alloys have been investigated by scanning electron microscopy (SEM),transmis
Cu-P-silicon carbide(SiC)composite coatings were deposited by means of electroless plating.The effects ofpH values,temperature,and different concentrations of s
An optimal replacement model for gamma deteriorating systems is studied.This methodology uses a gamma distribution to model the material degradation,and the imp
The optimum design of equivalent accelerated life testing plan based on proportional hazards-proportional odds model using D-optimality is presented.The defined
Polycrystalline samples of Bi1.5Pb0.5Sr2-xLaxCo2Oy (x =0.1,0.2,0.3) with a layered structure were prepared by solid-state reaction method.All samples are p-type
Olivine LiFePO4,as a cathode material for lithium ion batteries,was prepared by a novel optimized hydrothermal method; afterwards,the product mixed with glucose
对老住宅区供配电设施存在的问题及供配电改造中设施选型设计的相关问题进行分析，并提出相应的对策。