材料期刊网

Commercial Purity Aluminum with a BimodalGrain Size Distribution: Mechanical Properties, Deformation and Fracture Mechanisms

S.Billard , E.Meslin , G.F.Dirras , J.P.Fondère , B.Bacroix

材料科学技术（英文）

Commercial purity Al has been processed by hot isostatic pressing consolidation of nanopowders. The resulting bulk material contained a small fraction of microcrystalline grains (>300 nm) embedded in a matrix of ultrafine grains (150 nm). The mechanical properties under compressive tests at various temperatures and at a strain rate of 2×10－4 s－1 have been investigated. At room temperature a brief hardening was observed followed by a stagnation of the flow stress up to failure. From 150 to 200℃ softening occurred after a short hardening stage. A change in the behavior showed up at 300℃: a quasi perfect plasticity was observed subsequently to a yield point. The major deformation mechanisms include dynamic recovery, grain fragmentation and sliding. Besides, when tested up to rupture at elevated temperature filament formation where observed at the fracture surface. The formation mechanism of the filaments is possibly linked to the presence of a viscous-like phase at grain boundaries.

关键词: Aluminum , null , null , null

Preparation of Polycrystalline Singe-phase K0:3MoO3 by Hot Isostatic Pressing Sintering

Junfeng WANG , Rui XIONG , Ning SHU , Jing SHI , Zhengzhong JIN

材料科学技术（英文）

Nearly single-phase and polycrystalline charge-density-wave compound K0:3MoO3 have been prepared by using a simple method. In this work, K2CO3 and MoO3 were used as starting materials and reacted by hot isostatic pressing (HIP) sintering. The product is nearly single phase K0:3MoO3 determined by X-ray powder diffraction (XRD) and energy dispersive spectroscopy (EDS). Measurement of temperature dependence of resistivity reveals that the transport property of polycrystalline K0:3MoO3 obviously differs from that of single crystal due to the grain boundaries and the anisotropic structure in this kind of compound.

关键词: Blue bronze K0:3MoO3 , null , null , null

Effect of Hot Isostatic Pressing Conditions and Cooling Rate on Microstructure and Properties of Ti-6Al-4V Alloy from Atomized Powder

Lei Xu , Ruipeng Guo , Chunguang Bai , Jiafeng Lei , Rui Yang

材料科学技术（英文）

关键词:

TC11粉末钛合金的微观组织及其形成机理

徐桂华 , 张绪虎 , 赵翠梅 , 王亮 , 阴中炜

宇航材料工艺

通过旋转电极制粉及后续的热等静压工艺制备了全致密的TC11粉末钛合金,分析了材料的微观组织,通过理论分析和有限元模拟的方式探讨了材料独特的微观组织的形成机理.分析结果表明:粉末冶金TC11的微观组织主要由条片α+相间β相组成,同时还有部分细小的等轴α分布在粉末颗粒界面处.这种独特的微观组织是由两种工艺共同作用产生的.

关键词: TC11钛合金 , 粉末冶金 , 微观组织 , 热等静压

等静压技术在材料加工领域的应用现状

姜卓钰 , 张朋 , 包建文 , 王克俭

宇航材料工艺 doi:10.12044/j.issn.1007-2330.2017.01.003

主要阐述了等静压技术在金属、金属基复合材料、无机非金属材料以及聚合物材料等领域的应用现状,分析了等静压技术与3D打印复合成型技术的发展趋势,介绍了国内外等静压仿真模拟技术的研究进展,并对等静压技术的发展趋势提出展望.

关键词: 热等静压 , 冷等静压 , 粉末冶金 , 聚合物成型