MAGNETIC PROPERTIES AND STRUCTURES OF NANO－CRYSTALLINE Fe－P－C－Mo－Cu－Si ALLOYS

ＭＡＧＮＥＴＩＣＰＲＯＰＥＲＴＩＥＳＡＮＤＳＴＲＵＣＴＵＲＥＳＯＦＮＡＮＯ－ＣＲＹＳＴＡＬＬＩＮＥＦｅ－Ｐ－Ｃ－Ｍｏ－Ｃｕ－ＳｉＡＬＬＯＹＳ￥Ｙ．Ｆ．Ｇａｏ,Ｊ．Ｔａｎ;Ｇ．Ｄ．Ｌｉｕ;Ｃ．Ｌ．Ｚｈａｎｇ;Ｔ．ＬｉｕａｎｄＲ．ＺＭａ（ＲａｐｉｄｌｙＱ...     

DEFORMATION AND FRACTURE MECHANISMS OF TWO－PHASE TiAl－BASED ALLOYS WITH FULLY LAMELLAR MICROSTRUCTURE

ＤＥＦＯＲＭＡＴＩＯＮＡＮＤＦＲＡＣＴＵＲＥＭＥＣＨＡＮＩＳＭＳＯＦＴＷＯ－ＰＨＡＳＥＴｉＡｌ－ＢＡＳＥＤＡＬＬＯＹＳＷＩＴＨＦＵＬＬＹＬＡＭＥＬＬＡＲＭＩＣＲＯＳＴＲＵＣＴＵＲＥＹ．Ｇ．Ｚｈａｎｇ，Ｃ．Ｑ．Ｃｈｅｎ（ＢｅｉｊｉｎｇＵｎｉｖｅｒｓｉｔ...     

DEFORMATION AND FRACTURE OF TiAl PST CRYSTALS UNDER MONOTONIC AND CYCLIC LOADING

ＤＥＦＯＲＭＡＴＩＯＮＡＮＤＦＲＡＣＴＵＲＥＯＦＴｉＡｌＰＳＴＣＲＹＳＴＡＬＳＵＮＤＥＲＭＯＮＯＴＯＮＩＣＡＮＤＣＹＣＬＩＣＬＯＡＤＩＮＧＹ．Ｕｍａｋｏｓｈｉ；Ｔ．ＮａｋａｎｏａｎｄＨ．Ｙ．Ｙａｓｕｄａ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃ...     

EFFECT OF TRACE ELEMENTS WITH ZERO SELF－INTERACTIONCOEFFICIENT ON CRYSTALLIZATION TEMPERATUREOF IRON CARBON ALLOYS

ＥＦＦＥＣＴＯＦＴＲＡＣＥＥＬＥＭＥＮＴＳＷＩＴＨＺＥＲＯＳＥＬＦ－ＩＮＴＥＲＡＣＴＩＯＮＣＯＥＦＦＩＣＩＥＮＴＯＮＣＲＹＳＴＡＬＬＩＺＡＴＩＯＮＴＥＭＰＥＲＡＴＵＲＥＯＦＩＲＯＮＣＡＲＢＯＮＡＬＬＯＹＳＺＨＡＩＱｉｊｉｅａｎｄＨＵＨａｎｑｉ（Ｄｅｐ...     

INVESTIGATION ON THIN－WALL EFFECT OF A DIRECTIONALLY SOLIDIFIED SUPERALLOY BY USING TUBULAR SPECIMENS

ＩＮＶＥＳＴＩＧＡＴＩＯＮＯＮＴＨＩＮ－ＷＡＬＬＥＦＦＥＣＴＯＦＡＤＩＲＥＣＴＩＯＮＡＬＬＹＳＯＬＩＤＩＦＩＥＤＳＵＰＥＲＡＬＬＯＹＢＹＵＳＩＮＧＴＵＢＵＬＡＲＳＰＥＣＩＭＥＮＳＲ．Ｚ．ＣｈｅｎａｎｄＨ．Ｗ．Ｚｈａｎｇ（ＢｅｉｊｉｎｇＩｎｓｔｉｔｕｔ...     

DSC STUDY OF MARTENSITIC TRANSFORMATION KINETICS IN A Cu－Zn－Al－Mn－Ni SHAPE MEMORY ALLOY

ＤＳＣＳＴＵＤＹＯＦＭＡＲＴＥＮＳＩＴＩＣＴＲＡＮＳＦＯＲＭＡＴＩＯＮＫＩＮＥＴＩＣＳＩＮＡＣｕ－Ｚｎ－Ａｌ－Ｍｎ－ＮｉＳＨＡＰＥＭＥＭＯＲＹＡＬＬＯＹＧＥＮＧＧｕｉｌｉ;ＢＡＩＹｕｊｕｎ;ＰＥＮＧＱｉｆｅｎｇ（ＩｎｓｔｉｔｕｔｅｆｏｒＭａｔｅｒｉａ...     

DIFFUSION PHENOMENA AND MICROSTRUCTURE STABILITY OF Ni－Cr－Al－Y－Si COATING ON THENi_3Al BASED ALLOY SUBSTRATE

ＤＩＦＦＵＳＩＯＮＰＨＥＮＯＭＥＮＡＡＮＤＭＩＣＲＯＳＴＲＵＣＴＵＲＥＳＴＡＢＩＬＩＴＹＯＦＮｉ－Ｃｒ－Ａｌ－Ｙ－ＳｉＣＯＡＴＩＮＧＯＮＴＨＥＮｉ_３ＡｌＢＡＳＥＤＡＬＬＯＹＳＵＢＳＴＲＡＴＥＺ．Ｐ．Ｘｉｎｇ;Ｙ．Ｆ．Ｈａｎ;Ｙ．Ｌ．ＪｉａｎｄＭ．Ｇ?..     

EFFECT OF Mn CONTENT ON KINETIC PARAMETER DURING PHASE TRANSFORMATION IN CuZnAlMnNi SHAPE MEMORY ALLOYS

ＥＦＦＥＣＴＯＦＭｎＣＯＮＴＥＮＴＯＮＫＩＮＥＴＩＣＰＡＲＡＭＥＴＥＲＤＵＲＩＮＧＰＨＡＳＥＴＲＡＮＳＦＯＲＭＡＴＩＯＮＩＮＣｕＺｎＡｌＭｎＮｉＳＨＡＰＥＭＥＭＯＲＹＡＬＬＯＹＳ￥ＧｅｎｇＧｕｉｌｉ（ＩｎｓｔｉｔｕｔｅｆｏｒＭａｔｅｒｉａｌｓＥｎｇｉ...     

THE EFFECT OF SILICON ADDITIVE ON THESTRUCTURE AND PROPERTIES OFC－B_4C－SiC COMPOSITE

ＴＨＥＥＦＦＥＣＴＯＦＳＩＬＩＣＯＮＡＤＤＩＴＩＶＥＯＮＴＨＥＳＴＲＵＣＴＵＲＥ　ＡＮＤＰＲＯＰＥＲＴＩＥＳＯＦＣ－Ｂ_４Ｃ－ＳｉＣＣＯＭＰＯＳＩＴＥＨＵＡＮＧＱｉｚｈｏｎｇ;ＹＡＮＧＱｚａｏｑｉｎａｎｄＷＵＬｉｊｕｎ（ＰｏｗｄｅｒＭｅｔａｌｌｕｒｇ?..     

THERMAL CONDUCTIVITY OF Al-Li ALLOY AT CRYOGENIC TEMPERATURES

ＴＨＥＲＭＡＬＣＯＮＤＵＣＴＩＶＩＴＹＯＦＡｌ－ＬｉＡＬＬＯＹＡＴＣＲＹＯＧＥＮＩＣＴＥＭＰＥＲＡＴＵＲＥＳ￥ＳｕｎＤｏｎｇｓｈｅｎｇ；ＬｉＦｅｎｇｚｈａｏ；ＳｈａｎｇＬｅｉ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅ...     

SHAPE MEMORY EFFECT OF POLYCRYSTALLINE Fe-Mn-Si ALLOYS

The influence of quenching temperature on the shape memory effect(SME)of theFe-Mn-Si polycrystalline alloys and their martensitic transformation temperature have beenstudied.The SME of the hot-rolled specimen may be remarkably enhanced by selectingquenching temperature of 600—800℃.It has been shown that SME is influenced not only bythe distribution of ε-phase morphology but also by its pre-existence.     

THE STRESS-STRAIN-RESISTANCE RELATIONS IN Fe-Mn-Si ALLOYS

1. IntroductionThe strain sensitivity coefficients of resistance, K, have a value of about 2.0 in elasticregion for most alloys, such as constantan (a Cu-Ni alloy), karma (a Ni--Cr based alloy)and Fe-Cr-Al alloy, except Pt-W alloys. The K values are also about 2.0 in plastic regionfor the most alloys. For the ac--Fe--Mn-Al-Cr alloy it is also about 2.0 during plastic transformation, however, it becomes as high as 4.0--4.8 due to the antiferromagnetic transitionbelow the N6el temperature,…     

Effect of Cu addition on corrosion resistance and shape memory effect of Fe- 14Mn-5 Si-9Cr-5Ni alloy

The modification of Fe-14Mn-5Si-9Cr-5Ni shape memory alloys(SMAs) by copper addition was carried out, aiming at further enhancing its corrosion resistance. The results of electrochemical potentiodynamic measurement and immersion test show that copper can remarkably improve the corrosion resistance in Cl- solution. Otherwise, it is found that copper cannot markedly affect the mechanical properties nor the shape memory effect(SME). As for the effects of copper on Fe-Mn-Si based alloys, the austenite strengthening is one of the key factors to improve SME.     

铁基形状记忆合金（续完）

简介形状记忆效应(SME)的基本概念和形状记忆合金的发展。评述了Fe-Mn-Si,Fe-Mn-Si-Cr-Ni,Fe-Ni-Co-Ti和Fe-Ni-C等系铁基形状记忆合金的生长背景,特性及其SME的机制。     

铁基形状记忆合金（待续）

简介形状记忆效应(SME)的基本概念和形状记忆合金的发展。评述了Fe-Mn-Si,Fe-Mn-Si-Cr-Ni,Fe-Ni-Co-Ti和Fe-Ni-C等系铁基形状记忆合金的生长背景,特性及其SME的机制。     

钨尾矿微晶玻璃的形状记忆效应

研究了钨尾矿微晶玻璃的形状记忆效应（ＳＭＥ），并用Ｘ射线衍射法（ＸＲＤ）作了相分析。结果表明，钨尾矿微晶玻璃具有明显的ＳＭＥ；恢复应变随回复保温温度升高而增加；该材料随着变形量的减小，形状恢复率随之上升     

New insights to the promoted bainitic transformation in prior deformed austenite in a Fe-C-Mn-Si alloy

The varying trends of the amount and rate of bainitic transformation with strains at low temperature were investigated through metallography, X-ray diffraction and dilatometry. The results show that deformation at 573 K promotes bainitic transformation, whereas the promotion degree on bainite transformation by ausforming is nonlinear with strains. The amount of bainite in deformed austenite first increases and then decreases with the increase of strains. There exists a maximum value of the promotion effect corresponding to a critical small strain at a low temperature. Bainitic transformation rate can be increased by ausforming at low temperature, whereas a large strain weakens the acceleration effect. The amount of bainite in deformed materials is synthetically depended on the effect of enhanced nucleation and repressed growth. In addition, the volume fraction of retained austenite is not completely consistent with carbon content, indicating that ausforming plays a important role in determining the amount of austenite.     

INFLUENCE OF PROCESSING ON SHAPE MEMORY EFFECT OF Fe-Mn-Si-Ni-C-RE SHAPE MEMORY ALLOY

Effect of carbon, compound RE, quenching temperature, pre-strain and recovery temperature on shape memory effect (SME) of Fe-Mn-Si-Ni-C-RE shape memory alloy was studied by bent measurement, thermal cycle training, SEM etc. It was shown that the grains of alloys addition with compound RE became finer and SME increased evidently. SME of the alloy was weakening gradually as carbon content increased under small strain (3%). But in the condition of large strain (more than 6%), SME of the alloy whose carbon content range from 0.1% to 0.12% showed small decreasing range, especially of alloy with the addition of compound RE. Results were also indicated that SME was improved by increasing quenching temperature (>1000℃). The amount of thermal induced martensite increased and the relative shape recovery ratio could be increased to more than 40% after 3-4 times thermal training. The relative shape recovery ratio decreased evidently depending on rising of pre-strain. Furthermore, because speed of martensite transi     

奥氏体变形条件下低碳微合金钢中的贝氏体相变

采用Gleeble-1500热模拟机对低碳Mn-Nh-Ti钢进行了奥氏体区变形和变形后的冷却试验,借助于光学显微镜和扫描电镜分析了变形和冷却速度对显微组织的影响。结果表明,随着奥氏体形变量的增大,奥氏体向铁素体的相变增加,向贝氏体的相变减少,贝氏体中的铁素体和小岛由细长条状逐渐向近等轴状变化,铁素体板条间的小岛逐渐变化为存在于某些铁素体的晶界上。随着变形后的奥氏体冷却速度增大,铁素体量减少,贝氏体量增加,粒状贝氏体也逐渐由板条贝氏体所取代。     

形变热处理对截齿钎焊接头强度的影响

论证了形变热处理工艺运用于截齿生产实际的可行性。结果表明，形变热处理工艺的采用，可有效提高焊缝抗剪切强度，使经形变热处理的模拟截齿的剪切强度高达300MPa。