NiAl表面能的分子动力学计算

利用嵌入原子类型的势函数，通过分子动力学方法计算了Ｂ２结构标准化计量比ＮｉＡｌ合金的四个低指数晶面在６种温度时的表面能。计算结果表明，表面能随温度的升高呈增加趋势；最密排面的表面能最低；一些表面在高温下发生了重构或成分偏析等表面反应，用类似方法计算了ｆｃｃ结构Ｎｉ的表面能，计算结果与已知实验研究基本一致。     

Simulation of transformation mechanism of martensites in Ni_(62.5)Al_(37.5) alloy

Ｔｈｅｓｔｕｄｙｏｎｍａｒｔｅｎｓｉｔｉｃｔｒａｎｓｆｏｒｍａｔｉｏｎｉｓｔｈｅｏｒｅｔｉｃａｌｌｙａｎｄｐｒａｃｔｉｃａｌｌｙｉｍｐｏｒｔａｎｔ.Ｉｔｉｓｖｅｒｙｄｉｆｆｉｃｕｌｔｔｏｏｂｓｅｒｖｅｔｈｅｔｒａｎｓｆｏｒｍａｔｉｏｎｐｒｏｃｅｓｓｂｙｍｅａｎｓｏｆｅｘｐｅｒｉｍｅｎｔｓｂｅｃａｕｓｅｏｆｔｈｅｖｅｒｙｆａｓｔｓｐｅｅｄｏｆｔｒａｎｓｆｏｒｍａｔｉｏｎｓ,ｗｈｉｃｈｍａｋｅｓｑｕａｎｔｉｔａｔｉｖｅｓｔｕｄｙｄｉｆｆｉｃｕｌｔａｎｄｔｈｅｍｅｃｈａｎｉｓｍｏｆｎｕｃｌｅａｔｉｏｎａ…     

Effect of Compressive Deformation on Lenticular and Thin Plate Martensitic Transformations

The effect of compressive deformation testedabove the M_s temperature on the martensitemorphology in Fe-Ni-C alloys has been studied.Inthe Fe-30Ni-0.12C alloy,the M_s temperature is-50℃ The cylindrical specimens werecompressively deformed at -40℃.The strain rateswere 10,20,30 and 40%.X-ray analysis andmetallographic examination showed that nostrain-induced martensite was found.After quench-ing to -53℃,some thin plates and unusualmorphologies of lenticular martensites with bentand/or broken mid-ribs were observed.In theFe-30Ni-0.34C alloy,the M_s temperature is-120℃.Compressive deformation with differentstrain rates were carried out at room temperature.After quenching to the liquid nitrogen temperature,some bent thin plate matensites(unbroken)occur-red.The transformed twins in bent plate were alsobent and nearly parallel to the γ-α'interfaces.Orientation relationship between austenite and bentmartensite has been examined by means of trans-mission electron microscope.It was proved thatthese unusual morphologies are inherent in thecompressive pre-deformed austenite.     

在空间（微重力）凝固的金属材料

简述了与新材料开发相关的空间微重力科学研究成果以及在此基础研制的新产品。求救空间微重力科学应从事更多有应用背景的基础研究，为工业产业奠定理论基础。     

NiAl应力诱发马氏体的分子动力学模拟

利用嵌入原子势子函数，对标准化学计量比ＮｉＡｌ合金的应力诱发马氏体相变进行了分子动力学模拟，在拉应力作用下，３Ｒ结构的应力诱发马氏体中下部开始中形核，其长大过程为：先形成蝶状马氏体，并产生转变孪晶→不同取向的马氏体逐渐转化和合并→得到孪晶马氏体依次排列的微观结构，分析了应变的变化过程，探讨了马氏体形核的微观机理。     

铁基马氏体的界面形核与长大SCIEI

对分布在Fe-C,Fe-Ni-C及Fe-Cr-Mn-Mo-C合金中奥氏体晶粒界及孪晶界上的马氏体进行了观察分析。结果发现,马氏体易于在奥氏体晶粒界及孪晶界优先形核,并易于沿这些界面长大;在混合马氏体组织中,其界面优先形成的是片状马氏体或蝶状马氏体。     

马氏体相变的分形描述

概述了理论计算和Ｒｉｃｈａｒｄｓｏｎ作图两种测量谢宾斯基地毯分维的方法。用作图法测量了Ｆｅ－２９％Ｎｉ－０．１６％Ｃ合金冷至－１２５℃所得马氏体和残余奥氏体构成的显微组织的谢宾斯基分维。从作图法可知：（１）描述马氏体相变的谢宾斯基分维的物理意义是，分维值越大，残余奥氏体随马氏体尺寸减小而减少的比率越低；（２）由同一形态的马氏体和残余奥氏体构成的显微组织是否有谢宾斯基分维，决定于残余奥氏体面积和马氏体尺寸之间的关系是否满足　Ａ（ε）＝Ａ＿０ε￣（２－Ｄ）式。     

利用Marangoni对流制备均质偏晶合金

利用温度场下第二相液滴的Ｍａｒａｎｇｏｎｉ运动，设计了一种在地球重力场下制备均质偏晶合金的“控制铸造”新技术。在这种技术中，偏晶合金凝固界面前沿的第二相液滴将在重力场下作Ｓｔｏｋｅｓ运动和在温度梯度场下作与重力方向相反的Ｍａｒａｎｇｏｂｎｉ运动。     

Morphology and Effect of Pre-deformation on Martensites by Colored Metaliography August 24,1990

The colored metallography was used to inves-tigate the morphology of martensite in Fe-Ni-C al-loys.By compression deformation martensite trans-forms from lenticular to thin-plate.It is provedthat the bended and broken martensites are inher-ent from compressive predeformation of austenite.     

Structure and Mechanical Properties of High Si and Low C Steels

The investigation on lath martensitic transfor-mation has been carried out for 24SiMnNi2CrMoAsteel using transmission electron microscopy (TEM)and X-ray diffraction.The austenite andmartensite in the alloy adopt the intermediateorientation relationship between Kurdjumov-Sachsand Nishiyama.The adjacent laths in a packet aresmall-angle related or twin-related.The retainedaustenites which accommodate shape deformationof martensites appear commonly between adjacentlaths.High Si content increases the volume fractionof retained austenites and its stability.The excellentcombination of high strength and toughness of thissteel is attributed to its fine martensite laths mingledwith more than 5% continuous retained austenitefilms.