Powder Size Influence on Tensile Properties and Porosity for PM Ti2AlNb Alloy Prepared by Hot Isostatic Pressing

doi:10.1007/s40195-019-00928-w

Abstract

Abstract:

Pre-alloyed powder of Ti₂AlNb alloy was prepared by electrode induction gas atomization method, and the powder was screened into five kinds of powder size distribution. Fully dense Ti₂AlNb alloy was prepared by powder metallurgy (PM) using hot isostatic pressing. The properties of pre-alloyed powder and PM Ti₂AlNb alloy were tested. Results show that mean grain size of PM Ti₂AlNb alloy is influenced by powder particle size, but particle size has no significant influence on tensile properties. Finer Ti₂AlNb powder has low Argon gas bubble ratio and high oxygen content, and poor flowability of finer powder increases the degree of difficulty during degassing. As a result, big pores (>?50 μm) are observed in PM Ti₂AlNb alloy prepared by finer powder and cause plasticity loss of tensile properties. In order to get a better comprehensive properties of PM Ti₂AlNb alloy, powder with an average size (~?100 μm) is suggested.

Key words: Ti₂AlNb alloy, Powder metallurgy, Powder size distribution, Hot isostatic pressing

Zheng-Guan Lu, Jie Wu, Lei Xu, Rui Yang. Powder Size Influence on Tensile Properties and Porosity for PM Ti₂AlNb Alloy Prepared by Hot Isostatic Pressing[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(11): 1329-1336.

Figures/Tables 11

Fig. 1 Schematic diagram of a powder screening process and b flow rate testing process

Fig. 2 Dimensions (a) and photograph (b) of Ti2AlNb tensile samples

Fig. 3 SEM images and Nb element distribution of Ti2AlNb powder: a morphology of small powder, b morphology of large powder, c Nb element distribution in powder size d?=?50 μm, d Nb element distribution in powder size d?=?250 μm

Fig. 4 Contents of Al, Nb at chosen points along diameter of large and small powder

Table 1 Equivalent diameter of Ti2AlNb powder (P1-P5)

Powder number	Diameter size (μm)
Powder number	D ₁₀	D ₅₀	D ₉₀	D _{Volume weighted mean}
P1	19.7	46.4	90.1	51.1
P2	63.1	92.9	136.1	98.9
P3	58.3	128.8	229.4	136.9
P4	222.5	304.7	414.7	313.4
P5	36.5	110.0	275.8	135.7

Fig. 5 Oxygen content and gas bubble powder ratio of Ti2AlNb powder

Fig. 6 Flowability of P1-P5 Ti2AlNb powder

Fig. 7 SEM images of PM Ti2AlNb alloy prepared from P1-P5 powder

Fig. 8 Micro-CT images of PM Ti2AlNb alloy: a P1, b P2, c P3, d P4, e P5

Fig. 9 Pore statistics of Ti2AlNb alloy prepared by P1-P5 powder

Table 2 Tensile properties of PM Ti2AlNb alloy prepared by P1-P5 powder

Sample	T (^oC)	Ultimate tensile strength (MPa)	Yield strength (MPa)	Elongation (%)
P1	23	985	927	3.78
P2	23	1013	921	7.50
P3	23	1036	911	13.00
P4	23	1008	910	7.84
P5	23	1032	905	11.30
P1	650	784	721	15.10
P2	650	781	713	18.50
P3	650	780	705	21.60
P4	650	796	709	24.10
P5	650	783	695	17.00

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Powder Size Influence on Tensile Properties and Porosity for PM Ti₂AlNb Alloy Prepared by Hot Isostatic Pressing

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