Study on high temperature strengthening mechanism of ZrO2/Mo alloys

被引：22

作者：

Cui Chaopeng ^{[1
,2
]}

Zhu Xiangwei ^{[1
,2
]}

Li Qiang ^{[1
,2
]}

Zhang Min ^{[1
,2
]}

Zhu Guangping ^{[1
,2
]}

Liu Shulong ^{[1
,2
]}

机构：

[1] Huaibei Normal Univ, Sch Phys & Elect Informat, Informat Coll, Huaibei 235000, Anhui, Peoples R China

[2] Anhui Prov Key Labratory Pollutant Sensit Mat & E, Huaibei, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 829卷

基金：

安徽省自然科学基金;

关键词：

High temperature; ZrO(2 )particles; Tensile stress; Plasticity; NANO-SIZED ZRO2; DEFORMATION-BEHAVIOR; MO-LA2O3; ALLOYS; MICROSTRUCTURE;

D O I：

10.1016/j.jallcom.2020.154630

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

ZrO2/Mo alloy bars are fabricated by hydrothermal method and powder metallurgy process, with their microstructures, density, hardness, strength, reduction of area and elongation under ambient temperature investigated experimentally. The high temperature deformation stress of these alloy bars are tested through thermomechanical simulator. Results show that the second phase (ZrO2) in the microstructure was fine. As addition amount of the second phase increases, the microstructures of the matrix are refined, the density decreased while the hardness and strength are enhanced. Under high temperature, the second phase in ZrO2/Mo alloy bars can improve compressive stress of the alloy effectively by fine-grain strengthening and intra-granular and grain-boundary strengthening. At 1400 degrees C, the deformation stress of Mo alloy bars with 1.5% ZrO2 can be 20% higher than that of pure molybdenum. The strengthening effect of the second phase at high temperature are analyzed. The increase of strengthening effect is actually the manifestation of the pinning effect on hindering recrystallization behavior. It is shown that the improvement of mechanical properties of alloys at elevated temperatures should be mainly attributed to the retardation of recrystallization by the second phase. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：10

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