<strong>SPS</strong>烧结参数对<strong>NiAl-28Cr-5.5Mo-0.5Zr</strong>合金微观组织及室温力学性能的影响

doi:10.11900/0412.1961.2020.00346

金属学报

2021, Vol. 57

Issue (12): 1579-1587 DOI: 10.11900/0412.1961.2020.00346

研究论文

本期目录 | 过刊浏览

SPS烧结参数对NiAl-28Cr-5.5Mo-0.5Zr合金微观组织及室温力学性能的影响

刘泽, 宁汉维, 林彰乾, 王东君(

)

哈尔滨工业大学材料科学与工程学院哈尔滨 150001

Influence of Spark Plasma Sintering Parameters on the Microstructure and Room-Temperature Mechanical Properties of NiAl-28Cr-5.5Mo-0.5Zr Alloy

LIU Ze, NING Hanwei, LIN Zhangqian, WANG Dongjun(

)

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

引用本文:

刘泽, 宁汉维, 林彰乾, 王东君. SPS烧结参数对NiAl-28Cr-5.5Mo-0.5Zr合金微观组织及室温力学性能的影响[J]. 金属学报, 2021, 57(12): 1579-1587.
Ze LIU, Hanwei NING, Zhangqian LIN, Dongjun WANG. Influence of Spark Plasma Sintering Parameters on the Microstructure and Room-Temperature Mechanical Properties of NiAl-28Cr-5.5Mo-0.5Zr Alloy[J]. Acta Metall Sin, 2021, 57(12): 1579-1587.

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摘要:

以气雾化法制备的NiAl-28Cr-5.5Mo-0.5Zr (原子分数，%)预合金粉末为原料，采用放电等离子烧结(SPS)工艺制备了NiAl-28Cr-5.5Mo-0.5Zr块体合金(NiAl基合金)，研究了烧结温度、保温时间对烧结态合金致密度、微观组织以及室温压缩性能的影响。结果表明，SPS烧结温度对烧结态合金的致密度以及室温压缩性能的影响较大，而保温时间对其影响相对较小。在优化的烧结参数下：烧结温度为1200℃、保温时间为3 min、烧结压力为50 MPa，NiAl基合金的压缩屈服强度、抗压强度、塑性变形量分别为1321.4 MPa、2360 MPa和0.313。此外，分析了SPS工艺制备NiAl-28Cr-5.5Mo-0.5Zr合金的微观致密化过程。

关键词 ： NiAl基合金, 放电等离子烧结, 微观组织, 力学性能, 致密化

Abstract：

As a potential high-temperature structural material, the practical application of NiAl intermetallic compound is limited because of its low plasticity and fracture toughness at room temperature and poor strength at high temperature. Adding alloying elements and optimizing the preparation process are effective ways to improve the material's performance. In this study, NiAl-based alloys were prepared through spark plasma sintering using NiAl-28Cr-5.5Mo-0.5Zr (atom fraction, %) prealloyed powders. The influence of sintering temperature and holding time on the density, microstructure, and room-temperature compression properties of the sintered alloys was studied. The microstructures of the sintered alloys were investigated using SEM, and their room-temperature compression properties were tested using an electronic universal testing machine. It is shown that the influence of spark plasma sintering temperature on the density and room-temperature compression properties of sintered alloys is significant while that of the holding time is weaker. Under optimal sintering parameters, i.e., a sintering temperature of 1200^oC, holding time of 3 min, and sintering pressure of 50 MPa, the yield strength, compressive strength, and plasticity strain of the sintered alloy were 1321.4 MPa, 2360 MPa, and 0.313, respectively. Additionally, the densification process of NiAl-28Cr-5.5Mo-0.5Zr alloy prepared by spark plasma sintering was studied.

Key words： NiAl-based alloy spark plasma sintering microstructure mechanical property densification

收稿日期: 2020-09-04

ZTFLH:

TG146

基金资助:国家自然科学基金项目(91860122)

作者简介: 刘泽，男，1998年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00346 或 https://www.ams.org.cn/CN/Y2021/V57/I12/1579

图1 SPS烧结NiAl基合金工艺曲线

图2 不同温度烧结态NiAl基合金的XRD谱

图3 不同温度烧结态NiAl基合金的微观组织(a) 1100℃ (b) 1150℃ (c) 1200℃ (d) 1250℃

图4 烧结温度对烧结态NiAl基合金两相组织中Cr(Mo)相的平均宽度及合金密度的影响

图5 在1200℃不同时间烧结态NiAl基合金的XRD谱

图6 不同时间烧结态NiAl基合金的微观组织(a) 1 min (b) 3 min (c) 5 min (d) 7 min (e) 10 min (f) microcracks at the edge of specimen for t = 10 min

图7 保温时间对烧结态NiAl基合金两相组织中Cr(Mo)相的平均宽度及合金密度的影响

图8 不同烧结参数NiAl基合金的室温压缩性能

图9 NiAl基合金放电等离子烧结致密化过程示意图

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