Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第29卷    第7期    总第244期    2019年7月

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文章编号:1004-0609(2019)-07-1399-09
放电等离子烧结制备Ti-22Al-25Nb合金及致密化机理
贾建波1,杨 越1,孙 威1,仲晓晓1,徐 岩1, 2,顾勇飞1,骆俊廷1

(1. 燕山大学 先进锻压成形技术与科学教育部重点实验室,秦皇岛 066004;
2. 燕山大学 国家冷轧板带装备及工艺工程技术研究中心,秦皇岛 066004
)

摘 要: 以Ti-22Al-25Nb(摩尔分数,%)预合金粉末为实验初始原料,采用放电等离子烧结工艺(SPS)方法,在温度为950~1200 ℃,保温时间为10~20 min,压力为35~80 MPa的条件下制备晶粒小、组织致密的粉末冶金Ti-22Al-25Nb合金。研究烧结温度、烧结压力和保温时间对预合金粉末致密化过程的影响,分析粉末的烧结致密化机理,揭示烧结温度、烧结压力和保温时间对Ti-22Al-25Nb烧结合金的相对密度、相组成、显微组织以及力学性能的影响规律,明确烧结合金的室温断裂机制。结果表明:经950 ℃、80 MPa、10 min烧结的Ti-22Al-25Nb合金相对密度达到99.43%,具有更优异的综合力学性能,其室温伸长率、屈服强度和抗拉强度分别达到9.38%、933.57 MPa和990.01 MPa。

 

关键词: Ti-22Al-25Nb合金;放电等离子烧结;致密化;力学性能

Preparation and densification mechanism of Ti-22Al-25Nb alloy prepared by spark plasma sintering
JIA Jian-bo1, YANG Yue1, SUN Wei1, ZHONG Xiao-xiao1, XU Yan1, 2, GU Yong-fei1, LUO Jun-ting1

1. Education Ministry Key Laboratory of Advanced Forging and Stamping Technology and Science, Yanshan University, Qinhuangdao 066004;
2. National Engineering Research Center for Equipment and Technology of C.S.R, Yanshan University, Qinhuangdao 066004, China

Abstract:Ti-22Al-25Nb (mole fraction, %) pre-alloyed powders were used as the experimental starting materials. A powdery metallurgy Ti-22Al-25Nb alloy with fine grain size and dense microstructure was prepared using the spark plasma sintering process (SPS) method at the temperature of 950-1200 ℃, holding time of 10-20 min and pressure of 35-80 MPa. The effects of sintering temperature, sintering pressure and holding time on the densification of pre-alloyed powders were studied. The sintering densification mechanism was analyzed. The influences of sintering temperature, sintering pressure and holding time on the relative density, phase composition, microstructure and mechanical properties of the sintered Ti-22Al-25Nb alloy were revealed. In addition, the room temperature fracture mechanism of the sintered alloy was clarified. The results show that the relative density of the Ti-22Al-25Nb sintered alloy at (950 ℃, 80 MPa, 10 min) reaches 99.43%, and it has better comprehensive mechanical properties. The room temperature elongation, yield strength and tensile strength reach 9.38%, 933.57 MPa and 990.01 MPa, respectively.

 

Key words: Ti-22Al-25Nb alloy; spark plasma sintering; densification; mechanical property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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