TA15 is a near-alpha titanium alloy used when service conditions move beyond ordinary room-temperature structural duty. It is relevant for AM projects that need better strength retention and microstructural stability at elevated temperature than the standard Ti-6Al-4V route normally offers.
That immediately puts TA15 into a narrower and more application-specific material discussion than ordinary titanium powder queries. Teams are usually trying to solve a specific elevated-temperature structural problem when they ask about TA15.
TA15 powder grade data
TA15 is a Chinese titanium alloy designation; designations and chemistry for Chinese titanium grades are set by GB/T 3620.1-2016 (Designation and composition of titanium and titanium alloys, current edition). There is no ASTM grade number that is an exact equivalent, so an RFQ should reference GB/T 3620.1 or the program’s own material specification rather than a “similar” Western grade.
Typical partner-plant datasheet limits for TA15 powder, wt.% (the quoted lot COA governs; see the TA15 grade page):
| Element | Limit | Element | Limit |
|---|---|---|---|
| Ti | Balance | Fe | ≤0.25 |
| Al | 5.5–7.1 | C | ≤0.08 |
| Zr | 1.5–2.5 | O | ≤0.12 |
| Mo | 0.5–2.0 | N | ≤0.03 |
| V | 0.8–2.5 | H | ≤0.015 |
| LPBF test bars, heat treated | Tensile | Yield | Elongation |
|---|---|---|---|
| Room temperature | ≥1050 MPa | ≥950 MPa | ≥10% |
| 500 °C | ≥750 MPa | ≥600 MPa | ≥14% |
| 600 °C | ≥600 MPa | ≥400 MPa | ≥15% |
These are partner-plant values for test bars from one machine and heat-treatment route; they are a comparison basis, not a design allowable. PSD cuts offered: 15–53 µm for LPBF and a coarser 45–105 µm cut for EBM or DED, subject to equipment confirmation. For finished-part requirements on PBF titanium, ASTM F3302-18 is a general titanium-alloy framework; check whether your program accepts it for TA15 or requires its own specification.
Why engineers look at near-alpha titanium
Near-alpha alloy design is intended to support thermal stability and creep-related performance while keeping enough processability for real manufacturing use. That makes TA15 relevant for compressor-adjacent hardware, hot-structure development, and other cases where lightweight alone is not the only design driver.
Compared with Ti64, the conversation shifts away from general-purpose titanium use and toward service-temperature logic. That is why TA15 should be introduced only when the part actually needs the near-alpha route.
Powder quality priorities
Reactive alloy control remains the first filter. Oxygen and nitrogen pickup can erase the benefit of choosing a more demanding titanium grade in the first place. Teams should also pay attention to PSD consistency, morphology quality, and packaging integrity, because process variation on sensitive titanium systems becomes expensive quickly.
AM process considerations
TA15 is not usually selected just because it can be printed. It is selected because the full route can be managed: printing, thermal treatment, inspection, and long-term structural intent. That means qualification discussions should start earlier than they do for a general-purpose Ti-6Al-4V job.
That is why TA15 tends to stay narrower than mainstream titanium pages. The material is not for every titanium job. It is for the project that already knows service temperature changes the alloy decision.
If the job is still a general-purpose structural titanium decision, start with TC4/Ti64 powder instead of assuming a near-alpha alloy is automatically better. Hotter structural aerospace hardware is covered on this consolidated TA15 page; define the governing material specification, service-temperature profile, load case, heat treatment, qualification stage, and inspection basis.
TA15 for elevated-temperature aerospace structures
For elevated-temperature structural applications, the decision is selecting a near-alpha titanium powder route when elevated-temperature structural behavior is important enough that a general Ti64 route may not be sufficient.
| Question | TA15 review | Evidence required |
|---|---|---|
| Is service temperature genuinely controlling? | Compare the complete load-temperature-time cycle against Ti64 and other approved alloys | Program material basis and representative property data |
| Does AM create unique geometry value? | Internal features, consolidation, or low-volume geometry must justify qualification | Design/manufacturing trade study |
| Can chemistry and interstitials be controlled? | Exact TA15 basis, powder route, lot chemistry and contamination control | Lot COA and agreed methods |
| Can the thermal route be reproduced? | Stress relief, heat treatment, HIP and machining must be defined | Qualified process records and coupons |
| Is the final structure inspectable? | Critical zones, defect types, orientation and surfaces must be planned | NDE, dimensional and mechanical acceptance plan |
TA15 should not be offered as “higher-temperature Ti64” without an exact specification and property basis. Published wrought, forged, or another AM supplier’s data cannot qualify the proposed powder-machine route.
RFQ fields
Provide the TA15 specification, component class, service temperature and time, load, process and machine, PSD method, quantity, interstitial requirements, thermal route, inspection and mechanical evidence, and destination. Request the lot COA, PSD report, TDS/SDS, and available SEM or morphology data. If service is not truly temperature-led, begin with the Ti64 powder guide.